CA2096832C - Method and apparatus for paging in a communication system - Google Patents
Method and apparatus for paging in a communication systemInfo
- Publication number
- CA2096832C CA2096832C CA002096832A CA2096832A CA2096832C CA 2096832 C CA2096832 C CA 2096832C CA 002096832 A CA002096832 A CA 002096832A CA 2096832 A CA2096832 A CA 2096832A CA 2096832 C CA2096832 C CA 2096832C
- Authority
- CA
- Canada
- Prior art keywords
- site
- fixed base
- assigning
- paging
- pages
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/1607—Supply circuits
- H04B1/1615—Switching on; Switching off, e.g. remotely
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0209—Power saving arrangements in terminal devices
- H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
- H04W52/0229—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal where the received signal is a wanted signal
- H04W52/0232—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal where the received signal is a wanted signal according to average transmission signal activity
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
A fixed base-site (115) periodically pages subscribers (120) in a paging area (100). To prolong the battery life of the sub-scribers (120), paging groups (520) are not sent to subscribers (120) as often when the paging load is small. Since the subscribers (120) support discontinuous receive, processing of the pages will not take place as frequently and thus a battery savings is real-ized. When the fixed base-site (115) receives more pages than can be supported without exceeding a predetermined delay, the fixed base-site (115) dynamically increases the frequency that paging groups (520) are transmitted to subscribers (120). When the paging load decreases, the fixed base-site (115) dynamically decreases the frequency that paging groups (520) are transmitted to subscribers (120) and again a savings in battery life is realized.
Description
wo 92/10042 PCr~US91/08894 3 ~
METHOD AND APPARATUS FOR PAGING
IN A COMMUNICATION SYSTEM
Field of the Invention This invention relates generally to radiotelephone systems and more specifically to radiotelephone systems which page subscribers to establish a ~communication link.
l 5 Background of the Invention In many cellular applications, the battery life of subscriber units such as portables or transportables is a prime concern. Some cellular systems, such as the GSM
METHOD AND APPARATUS FOR PAGING
IN A COMMUNICATION SYSTEM
Field of the Invention This invention relates generally to radiotelephone systems and more specifically to radiotelephone systems which page subscribers to establish a ~communication link.
l 5 Background of the Invention In many cellular applications, the battery life of subscriber units such as portables or transportables is a prime concern. Some cellular systems, such as the GSM
2 0 (Groupe Special Mobile) Digital Cellular System, support "discontinuous receive" (DRX) a feature whereby pages, or calls to subscriber units, are uniformly broken into different groups and bro~e~st over the air at specific illtel ~als. This mech~ni~m allows mobiles which are not 25 presently in use to "sleep" when pages to it are not being brm~c-~t The larger the number of groups the pages are broken into, the longer the period that a mobile can sleep before nee~ling to awaken in order to check for pages that may be destined for it. This mechani~m is limite~, 3 U however, in that the largest number of paging groups (which correspond to the greatest battery savings) introduce the largest amount of delay into the system paging response time. Likcwise, the configuration that .
wo 92/10~42 introduces minimum system response delay also corresponds to the greatest level of standby battery consumption.
Thus, the need exists for a radiotelephone system which co,..~lolnises between the ol,~osillg constraints of battery drain and system l~sl ollse delay.
S~1rnm~ry of thc Invention A fixed base-site in a radiotelephone system is disclosed. The fixed base-1 0 site is coupled to an external interface. The external interface periodically sendsa paging request to request the fixed base-site to page individually a plurality of subscribers. The fixed base-site provides a plurality of repetitive timeslots, including at least first and second timeslots, and a predetermined time difference 1 5 value and a predetermined threshold value. The fixed base-site receives a paging request from the external interface, generates a paging signal in response to the receiving a paging request, means for ~ ning the generated paging signal to the first timeslot, and, responsive to the ~ignment, transmit the paging signal 2 0 to at least one subscriber. The fixed base-site determines a time differencebetween a time when the one paging request is received and a time when the one paging signal is transmitted. Responsive to the determination, the fixed base-site measures, relative to the number of pages received, the number of pages having the determined time difference greater than the predetermined time difference 2 5 value; and responsive to the measurement assigns the generated paging signal additionally to the second timeslot when the measured number of pages is greaterthan the predetermined threshold value.
Brief Description of the Drawings FIG. 1 generally depicts a TDMA radiotelephone system that could employ the IJlCsc.~t invention.
FIG. 2 generally illustrates a block diagram of the fixed base-site.
FIG. 3 generally depicts a GSM TDMA frame.
FIG. 4 generally illustrates GSM TDMA frames - comprising a multiframe.
,~
~WO 92/10042 2 0 9 6 8 3 2 PCr/US91/08894 FIG. 5 generally depicts paging groups versus DRX
factors in accordance with the invention.
FIG. 6 illustrates load versus load induced queueing delay for a family of varying DRX factors in accordance 5 with the invention.
FIG. 7 depicts a typical hysteresis between varying DRX factors in accordance with the invention.
FIG. 8 illustrates a flow diagram of the steps the fixed base-site undergoes to perform hysteresis in accordance 10 with the invention.
Detailed Description of a Preferred Embodiment FIG. 1. generally depicts a TDMA radiotelephone system in accordance with the invention. In the preferred embodiment, the system is the Groupe Special Mobile (GSM) Pan European Digital Cellular System, but the invention may apply to any systems that support 2 0 discontinuous transmission/reception. The GSM system is comprised of a plurality of cells 105 which when combined form paging areas 100. Each cell 105 in a paging area 100 has located within its boundary a base-site 1 15 which is used to communicate to a mobile 120. Each base-site 115 2 5 is coupled to another base-site through a switch 110, which in the preferred embodiment is a Motorola EMX 2500E.
The switch in turn is typically connected to a public switched telephone network (PSTN) 125. Generally, the operation of the system is as follows. The mobile 120 3 0 enters the paging area 100, which again is subdivided into cells 105. The mobile 120 registers with the switch 110 through the particular base-site 115 whose cell 105 it is in.
The mobile 120 is now registered to the particular paging area 100 the base-site 115 is located in. For a land-to-mobile call, every cell 105 in the paging area 100 transmits a page to the mobile 120. If the mobile 120 is still in the paging area 100, it will transmit a response back to the base-site 115 whose cell 105 it is in. The corresponding base-site 115 will communicate back to the switch 110 that the mobile 120 responded and the land-to-mobile call is then established.
FIG. 2 generally depicts the internal architecture of 1 0 the base-site 105. A typical interface 200 is coupled to a processor 205, which is a Motorola MC68030 in the preferred embodiment. Typical memory 210 is coupled to the processor 205 and is used to store look-up tables, algorithms, etc. The processor 205 is in turn coupled to a 1 5 transmitter/receiver 220 which provides an interface to the RF environment. Generally, a page request will be received by the interface 200 and sent to the processor 205 for processing. After processing, the request is sent to the transmitter/receiver 220 where it is transmitted over 2 0 the air to the mobile 120.
FIG. 3 generally depicts a GSM TDMA frame 300 as defined in GSM Recommendation 5.02, version 3.4.1, January, 1990. Repetitive TDMA frames 300 are sent contain traffic and control data and are sent out of the 2 5 base-site 115 on carriers of different frequencies to the mobile 120. In the preferred embodiment, each TDMA
frame 300 is 4.62 milliseconds and is comprised of eight timeslots 305. Each timeslot 305 is approximately 577 microseconds and may contain traffic or control data.
3 0 Timeslot zero of every TDMA frame 300 of at least one camer is typically reserved for control data. FIG. 4 depicts a multiframe 400 as defined in GSM Recommendation 5.02, version 3.4.1, January, 1990. A multiframe 400 is ~WO 92/10042 PCI/US91/08894 approximately 235.38 milliseconds, is comprised of 51 TDMA frames 300 and contains control data. In the preferred embodiment, it is the multiframe 400 which contains the paging information in accordance with the invention.
FIG. 5 depicts a series of multiframes 500, which in the preferred embodiment contain three paging groups 520 in accordance with the invention. Each paging group 520 contains pages for up to four separate subscribers 120, 1 0 thus up to twelve separate subscribers 120 can be paged every multiframe 400. Multiframe series 500 depicts three paging groups sent out every multiframe. The mobile 120 supports discontinuous receive, which is defined by GSM recommendation 4.08, version 3.9.0, July, 1 5 1990 and GSM Recommendation 5.02, version 3.4.1, January, 1990. During discontinuous receive, the mobile 120 "sleeps" when a paging group is not received. When the mobile 120 enters a particular paging area 100, part of the registration process the entire system undergoes is for 2 0 the base-site 115 to notify the mobile 120 how often to "wake up" and process a page. A term called the 'DRX
factor' is introduced to help describe the repetition of paging groups 520. For example, multiframe series 500 represents no DRX factor thus when the base-site 115 2 5 pages the mobile 120, the mobile 120 will wake up every mllltiframe 400 and process the pages found in all of the three paging groups 520. This means the mobile is processing, and thus using battery energy, every multiframe 400. Multiframe series 505 represents a DRX
3 0 factor of 2, or in other words, the mobile 120 wakes up every other multiframe to process the page found in one of the three paging groups 520. Likewise, multiframe series 510 represents a DRX factor of 4 thus the mobile 120 wo 92/10042 2 0 9 6 8 3 2 PCr/US91/0~
wakes up every fourth multiframe to process the page found in one of the three paging groups 520. It is clear the mobile will sleep longer for higher DRX factors and less for lower DRX factors. This means that the larger the DRX
factor, the less processing required by the mobile to interpret the paging groups 320 and thus, the larger the battery savings. In the preferred embodiment, the system can have a DRX factor of up to 9.
The system, while supporting discontinuous receive at the mobile 120 and incorporating the DRX factors described in FI&. 5, does not compromise load induced queuing delays. For example, the multiframe series S00 represents no DRX factor, thus mobiles will process pages every multiframe 400. In the preferred embodiment, three multiframes, up to 36 pages in all, are required to support approxim~tely 80,000 to 100,000 subscribers in a given paging area 100. At high usage time, the number of pages that the system will be required to make will be high. For smaller DRX factors, say 2 or 3, the paging groups 2 0 520 are sent out enough to support the high paging load thus keeping the load induce queueing delay within desired boundaries. Larger DRX factors, however, are not sent out as often consequently causing excessive delays during busy hour loading conditions.
FIG. 6 shows delay versus paging load for a family of differing DRX factors. As can be seen, when the DRX factor is low, paging groups 520 are sent out more often thus keeping the pages in the paging request queue at a minimum and consequently minimi7ing transmission delay.
3 0 As the DRX factor increases, mobiles 120 do not process as often causing the paging request queue to build which in turn results in increasing transmission delay. The curves shown for the different DRX factors handle up to ~vo 92/10042 2 0 9 6 8 3 2 Pcr/ussl/o8894 -approximately 20 pages per second within a reasonable delay time but as the paging load increases, higher DRX
factors introduce increased paging request queue time and thus transmission delay.
The DRX factor can be changed based on the time of day, paging load and paging load queueing delay. FIG. 7 depicts how the compromise between paging load, paging load queueing delay and battery savings in the mobile 120 is performed. The base-site 115 assumes that a given delay is acceptable; for this example, the acceptable delay will be 2.5 second. As seen, a DRX factor of eight would maximize battery conservation and yet stay within delay limitations up to approximately 16 pages per second (point "A" in the example). Above this, the DRX factor would be reduced by the system to a DRX factor of 4 (for example) in order to keep the system delays within limits. If the paging load were to climb further to approximately 24 pages per second (point "B" in the example), the DRX factor could be reduced by the system even further to perhaps 2.
2 0 If the paging load were to increase even further (point "C"
perhaps), a system configuration change which would perhaps increase the number of paging groups ~20 per multiframe 400 would have to occur. As the paging load decreases (point "D"), the system can increase the DRX
2 5 factor back to 4 where the total number of pages required is tolerable for that DRX factor. If the number of pages per second were to decrease even further (point "E"), the system can increase the DRX factor from 4 to 8 and still stay within the specified delay limit. This "hysteresis" is 3 0 then repeated as the paging load begins to increase.
The paging delay can be determined several ways, the most direct of which is to time stamp the pages as they arrive at the base-site 1 15. As the pages are sent out, the wo 92/10042 2 0 9 6 8 3 2 Pcr/ussl/os~
-time stamp can be compared to the present time to determine the delay. Another method is to measure the depth of the paging queue for each separate paging group to be sent out. The depth of the queue can be used as an 5 estimate of the delay pages will experience. In either case, whether queue depth or delay time is used as a criterion for excessive delay, the percentage of pages above an upper threshold (delayed more than a predetermined time difference value Tu or queueing deeper than a 10 predetermined queue length value Qu) compared with the total pages accumulated over a time interval T1 falls above an acceptable percentage, a decrease in the DRX factor is required in order to keep delays within desired limits.
Likewise, a lower threshold can be established such that 15 when the percentage of pages below a lower threshold (TL
and QL) compared to the total pages accumulated over a time interval T2 falls below an acceptable percentage, the DRX factor can be increased in order to conserve battery drain. The time interval Tl should be shorter than T2 so 20 that it takes a relatively short time to decrease the DRX
factor due to a rising paging load and a relatively long time - to increase the DRX factor in the face of a decreasing paging load.
FIG. 8 is a flow diagram generally depicting the steps 2 5 the system undergoes to perform the hysteresis in accordance with the invention. The process starts at 800 by setting at 803 time interval T1 and T2 equal to 0. The base-site 1 15 then measures at 806 the percentage of pages that have delay or queue length greater than 3 0 thresholds Tu and QU over the time interval T1. The base-site 11~ also measures at 809 the percentage of pages that have delay or queue length less than thresholds TL and QL
over the time interval T2. A test is then performed at 812 ~10 92~10042 2 O 9 6 8 3 2 PCI/US91/08894 q_ to determine if the time interval Tl has expired. If the time interval Tl has expired, a test is performed at 815 to determined if the measured percentage greater than the upper thresholds (Tu and Qu) shows a need for a lower DRX
5 factor. If it does, a test is performed at 824 to determine if the DRX factor is at a minimum for the current configuration. If it is, T2 is set to zero, the base-site 115 is reconfigured to transmit more page groups per multiframe, the DRX factor is set to a m~xim~lm at 827 and the process 1 0 repeats starting at block 806. If the DRX factor is not at a minimum, T2 is set to zero, the base-site 115 moves to a lower DRX factor at 830 and again the process repeats starting at block 806.
Returning to blocks 812 and 815, if time interval T
1 5 has expired or the measured percentage does not show a need for a lower DRX factor, the base-site 115 performs a test at 818 to determine if time interval T2 has expired. If it has, a test is performed at 821 to determine if the measured percentage below the lower thresholds (TL and 2 O QL) show a need for a higher DRX factor. If it does not or if time interval T2 has not expired, the process repeats starting at block 806. If the measured percentage below the lower thresholds shows a need for a higher DRX factor, the base-site 115 performs a test at 833 to determine if 25 the DRX factor is at a minimum for the current configuration. If it is not, Tl is set to zero, the base-site 115 moves to a higher DRX factor at 839 and again the process repeats starting at block 806. If the DRX factor is at a m~ximum for the current configuration, a test is 3 0 performed at 836 to determine if a more minimum configuration (a configuration whereby less page groups per multiframe are transmitted) exists. If it does not, the process repeats starting at block 806. If a more minimum wo 92~10042 2 0 9 6 8 3 2 Pcr/us9l/o83~
'10 configuration does exist, Tl is set to zero, the base-site 115 changes configuration, the DRX factor for the new configuration is set at a minimum at 842 and the process repeats starting at block 806.
While performing the hysteresis, the base-site 1 15 constantly keeps track of such factors as transmission delay, queue depth and paging load and dynamically changes the DRX factor or the rate at which mobiles 120 process pages. In this way, the base-site 11 5 maintains efficient paging of mobiles 1 20 while prolonging the battery life of those mobiles.
What I claim is:
wo 92/10~42 introduces minimum system response delay also corresponds to the greatest level of standby battery consumption.
Thus, the need exists for a radiotelephone system which co,..~lolnises between the ol,~osillg constraints of battery drain and system l~sl ollse delay.
S~1rnm~ry of thc Invention A fixed base-site in a radiotelephone system is disclosed. The fixed base-1 0 site is coupled to an external interface. The external interface periodically sendsa paging request to request the fixed base-site to page individually a plurality of subscribers. The fixed base-site provides a plurality of repetitive timeslots, including at least first and second timeslots, and a predetermined time difference 1 5 value and a predetermined threshold value. The fixed base-site receives a paging request from the external interface, generates a paging signal in response to the receiving a paging request, means for ~ ning the generated paging signal to the first timeslot, and, responsive to the ~ignment, transmit the paging signal 2 0 to at least one subscriber. The fixed base-site determines a time differencebetween a time when the one paging request is received and a time when the one paging signal is transmitted. Responsive to the determination, the fixed base-site measures, relative to the number of pages received, the number of pages having the determined time difference greater than the predetermined time difference 2 5 value; and responsive to the measurement assigns the generated paging signal additionally to the second timeslot when the measured number of pages is greaterthan the predetermined threshold value.
Brief Description of the Drawings FIG. 1 generally depicts a TDMA radiotelephone system that could employ the IJlCsc.~t invention.
FIG. 2 generally illustrates a block diagram of the fixed base-site.
FIG. 3 generally depicts a GSM TDMA frame.
FIG. 4 generally illustrates GSM TDMA frames - comprising a multiframe.
,~
~WO 92/10042 2 0 9 6 8 3 2 PCr/US91/08894 FIG. 5 generally depicts paging groups versus DRX
factors in accordance with the invention.
FIG. 6 illustrates load versus load induced queueing delay for a family of varying DRX factors in accordance 5 with the invention.
FIG. 7 depicts a typical hysteresis between varying DRX factors in accordance with the invention.
FIG. 8 illustrates a flow diagram of the steps the fixed base-site undergoes to perform hysteresis in accordance 10 with the invention.
Detailed Description of a Preferred Embodiment FIG. 1. generally depicts a TDMA radiotelephone system in accordance with the invention. In the preferred embodiment, the system is the Groupe Special Mobile (GSM) Pan European Digital Cellular System, but the invention may apply to any systems that support 2 0 discontinuous transmission/reception. The GSM system is comprised of a plurality of cells 105 which when combined form paging areas 100. Each cell 105 in a paging area 100 has located within its boundary a base-site 1 15 which is used to communicate to a mobile 120. Each base-site 115 2 5 is coupled to another base-site through a switch 110, which in the preferred embodiment is a Motorola EMX 2500E.
The switch in turn is typically connected to a public switched telephone network (PSTN) 125. Generally, the operation of the system is as follows. The mobile 120 3 0 enters the paging area 100, which again is subdivided into cells 105. The mobile 120 registers with the switch 110 through the particular base-site 115 whose cell 105 it is in.
The mobile 120 is now registered to the particular paging area 100 the base-site 115 is located in. For a land-to-mobile call, every cell 105 in the paging area 100 transmits a page to the mobile 120. If the mobile 120 is still in the paging area 100, it will transmit a response back to the base-site 115 whose cell 105 it is in. The corresponding base-site 115 will communicate back to the switch 110 that the mobile 120 responded and the land-to-mobile call is then established.
FIG. 2 generally depicts the internal architecture of 1 0 the base-site 105. A typical interface 200 is coupled to a processor 205, which is a Motorola MC68030 in the preferred embodiment. Typical memory 210 is coupled to the processor 205 and is used to store look-up tables, algorithms, etc. The processor 205 is in turn coupled to a 1 5 transmitter/receiver 220 which provides an interface to the RF environment. Generally, a page request will be received by the interface 200 and sent to the processor 205 for processing. After processing, the request is sent to the transmitter/receiver 220 where it is transmitted over 2 0 the air to the mobile 120.
FIG. 3 generally depicts a GSM TDMA frame 300 as defined in GSM Recommendation 5.02, version 3.4.1, January, 1990. Repetitive TDMA frames 300 are sent contain traffic and control data and are sent out of the 2 5 base-site 115 on carriers of different frequencies to the mobile 120. In the preferred embodiment, each TDMA
frame 300 is 4.62 milliseconds and is comprised of eight timeslots 305. Each timeslot 305 is approximately 577 microseconds and may contain traffic or control data.
3 0 Timeslot zero of every TDMA frame 300 of at least one camer is typically reserved for control data. FIG. 4 depicts a multiframe 400 as defined in GSM Recommendation 5.02, version 3.4.1, January, 1990. A multiframe 400 is ~WO 92/10042 PCI/US91/08894 approximately 235.38 milliseconds, is comprised of 51 TDMA frames 300 and contains control data. In the preferred embodiment, it is the multiframe 400 which contains the paging information in accordance with the invention.
FIG. 5 depicts a series of multiframes 500, which in the preferred embodiment contain three paging groups 520 in accordance with the invention. Each paging group 520 contains pages for up to four separate subscribers 120, 1 0 thus up to twelve separate subscribers 120 can be paged every multiframe 400. Multiframe series 500 depicts three paging groups sent out every multiframe. The mobile 120 supports discontinuous receive, which is defined by GSM recommendation 4.08, version 3.9.0, July, 1 5 1990 and GSM Recommendation 5.02, version 3.4.1, January, 1990. During discontinuous receive, the mobile 120 "sleeps" when a paging group is not received. When the mobile 120 enters a particular paging area 100, part of the registration process the entire system undergoes is for 2 0 the base-site 115 to notify the mobile 120 how often to "wake up" and process a page. A term called the 'DRX
factor' is introduced to help describe the repetition of paging groups 520. For example, multiframe series 500 represents no DRX factor thus when the base-site 115 2 5 pages the mobile 120, the mobile 120 will wake up every mllltiframe 400 and process the pages found in all of the three paging groups 520. This means the mobile is processing, and thus using battery energy, every multiframe 400. Multiframe series 505 represents a DRX
3 0 factor of 2, or in other words, the mobile 120 wakes up every other multiframe to process the page found in one of the three paging groups 520. Likewise, multiframe series 510 represents a DRX factor of 4 thus the mobile 120 wo 92/10042 2 0 9 6 8 3 2 PCr/US91/0~
wakes up every fourth multiframe to process the page found in one of the three paging groups 520. It is clear the mobile will sleep longer for higher DRX factors and less for lower DRX factors. This means that the larger the DRX
factor, the less processing required by the mobile to interpret the paging groups 320 and thus, the larger the battery savings. In the preferred embodiment, the system can have a DRX factor of up to 9.
The system, while supporting discontinuous receive at the mobile 120 and incorporating the DRX factors described in FI&. 5, does not compromise load induced queuing delays. For example, the multiframe series S00 represents no DRX factor, thus mobiles will process pages every multiframe 400. In the preferred embodiment, three multiframes, up to 36 pages in all, are required to support approxim~tely 80,000 to 100,000 subscribers in a given paging area 100. At high usage time, the number of pages that the system will be required to make will be high. For smaller DRX factors, say 2 or 3, the paging groups 2 0 520 are sent out enough to support the high paging load thus keeping the load induce queueing delay within desired boundaries. Larger DRX factors, however, are not sent out as often consequently causing excessive delays during busy hour loading conditions.
FIG. 6 shows delay versus paging load for a family of differing DRX factors. As can be seen, when the DRX factor is low, paging groups 520 are sent out more often thus keeping the pages in the paging request queue at a minimum and consequently minimi7ing transmission delay.
3 0 As the DRX factor increases, mobiles 120 do not process as often causing the paging request queue to build which in turn results in increasing transmission delay. The curves shown for the different DRX factors handle up to ~vo 92/10042 2 0 9 6 8 3 2 Pcr/ussl/o8894 -approximately 20 pages per second within a reasonable delay time but as the paging load increases, higher DRX
factors introduce increased paging request queue time and thus transmission delay.
The DRX factor can be changed based on the time of day, paging load and paging load queueing delay. FIG. 7 depicts how the compromise between paging load, paging load queueing delay and battery savings in the mobile 120 is performed. The base-site 115 assumes that a given delay is acceptable; for this example, the acceptable delay will be 2.5 second. As seen, a DRX factor of eight would maximize battery conservation and yet stay within delay limitations up to approximately 16 pages per second (point "A" in the example). Above this, the DRX factor would be reduced by the system to a DRX factor of 4 (for example) in order to keep the system delays within limits. If the paging load were to climb further to approximately 24 pages per second (point "B" in the example), the DRX factor could be reduced by the system even further to perhaps 2.
2 0 If the paging load were to increase even further (point "C"
perhaps), a system configuration change which would perhaps increase the number of paging groups ~20 per multiframe 400 would have to occur. As the paging load decreases (point "D"), the system can increase the DRX
2 5 factor back to 4 where the total number of pages required is tolerable for that DRX factor. If the number of pages per second were to decrease even further (point "E"), the system can increase the DRX factor from 4 to 8 and still stay within the specified delay limit. This "hysteresis" is 3 0 then repeated as the paging load begins to increase.
The paging delay can be determined several ways, the most direct of which is to time stamp the pages as they arrive at the base-site 1 15. As the pages are sent out, the wo 92/10042 2 0 9 6 8 3 2 Pcr/ussl/os~
-time stamp can be compared to the present time to determine the delay. Another method is to measure the depth of the paging queue for each separate paging group to be sent out. The depth of the queue can be used as an 5 estimate of the delay pages will experience. In either case, whether queue depth or delay time is used as a criterion for excessive delay, the percentage of pages above an upper threshold (delayed more than a predetermined time difference value Tu or queueing deeper than a 10 predetermined queue length value Qu) compared with the total pages accumulated over a time interval T1 falls above an acceptable percentage, a decrease in the DRX factor is required in order to keep delays within desired limits.
Likewise, a lower threshold can be established such that 15 when the percentage of pages below a lower threshold (TL
and QL) compared to the total pages accumulated over a time interval T2 falls below an acceptable percentage, the DRX factor can be increased in order to conserve battery drain. The time interval Tl should be shorter than T2 so 20 that it takes a relatively short time to decrease the DRX
factor due to a rising paging load and a relatively long time - to increase the DRX factor in the face of a decreasing paging load.
FIG. 8 is a flow diagram generally depicting the steps 2 5 the system undergoes to perform the hysteresis in accordance with the invention. The process starts at 800 by setting at 803 time interval T1 and T2 equal to 0. The base-site 1 15 then measures at 806 the percentage of pages that have delay or queue length greater than 3 0 thresholds Tu and QU over the time interval T1. The base-site 11~ also measures at 809 the percentage of pages that have delay or queue length less than thresholds TL and QL
over the time interval T2. A test is then performed at 812 ~10 92~10042 2 O 9 6 8 3 2 PCI/US91/08894 q_ to determine if the time interval Tl has expired. If the time interval Tl has expired, a test is performed at 815 to determined if the measured percentage greater than the upper thresholds (Tu and Qu) shows a need for a lower DRX
5 factor. If it does, a test is performed at 824 to determine if the DRX factor is at a minimum for the current configuration. If it is, T2 is set to zero, the base-site 115 is reconfigured to transmit more page groups per multiframe, the DRX factor is set to a m~xim~lm at 827 and the process 1 0 repeats starting at block 806. If the DRX factor is not at a minimum, T2 is set to zero, the base-site 115 moves to a lower DRX factor at 830 and again the process repeats starting at block 806.
Returning to blocks 812 and 815, if time interval T
1 5 has expired or the measured percentage does not show a need for a lower DRX factor, the base-site 115 performs a test at 818 to determine if time interval T2 has expired. If it has, a test is performed at 821 to determine if the measured percentage below the lower thresholds (TL and 2 O QL) show a need for a higher DRX factor. If it does not or if time interval T2 has not expired, the process repeats starting at block 806. If the measured percentage below the lower thresholds shows a need for a higher DRX factor, the base-site 115 performs a test at 833 to determine if 25 the DRX factor is at a minimum for the current configuration. If it is not, Tl is set to zero, the base-site 115 moves to a higher DRX factor at 839 and again the process repeats starting at block 806. If the DRX factor is at a m~ximum for the current configuration, a test is 3 0 performed at 836 to determine if a more minimum configuration (a configuration whereby less page groups per multiframe are transmitted) exists. If it does not, the process repeats starting at block 806. If a more minimum wo 92~10042 2 0 9 6 8 3 2 Pcr/us9l/o83~
'10 configuration does exist, Tl is set to zero, the base-site 115 changes configuration, the DRX factor for the new configuration is set at a minimum at 842 and the process repeats starting at block 806.
While performing the hysteresis, the base-site 1 15 constantly keeps track of such factors as transmission delay, queue depth and paging load and dynamically changes the DRX factor or the rate at which mobiles 120 process pages. In this way, the base-site 11 5 maintains efficient paging of mobiles 1 20 while prolonging the battery life of those mobiles.
What I claim is:
Claims (32)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A fixed base-site in a radiotelephone system, the fixed base-site coupled to an external interface wherein the external interface periodically sends a paging request to request the fixed base-site to page individually a plurality of subscribers, the fixed base-site comprising:
means for providing a plurality of repetitive timeslots, including at least first and second timeslots;
means for providing a predetermined time difference value and a predetermined threshold value;
means for receiving a paging request from the external interface;
means for generating a paging signal in response to said receiving a paging request;
means for assigning said generated paging signal to said first timeslot;
means, responsive to said means for assigning, for transmitting said paging signal to at least one subscriber;
means for determining a time difference between a time when said means for receiving receives said one paging request and a time when said means for transmitting transmits said one paging signal;
means, responsive to said means for determining, for measuring, relative to the number of pages said means for receiving receives, the number of pages having said determined time difference greater than said predetermined time difference value; and means, responsive to said means for measuring, for assigning said generated paging signal additionally to said second timeslot when said measured number of pages is greater than said predetermined threshold value.
means for providing a plurality of repetitive timeslots, including at least first and second timeslots;
means for providing a predetermined time difference value and a predetermined threshold value;
means for receiving a paging request from the external interface;
means for generating a paging signal in response to said receiving a paging request;
means for assigning said generated paging signal to said first timeslot;
means, responsive to said means for assigning, for transmitting said paging signal to at least one subscriber;
means for determining a time difference between a time when said means for receiving receives said one paging request and a time when said means for transmitting transmits said one paging signal;
means, responsive to said means for determining, for measuring, relative to the number of pages said means for receiving receives, the number of pages having said determined time difference greater than said predetermined time difference value; and means, responsive to said means for measuring, for assigning said generated paging signal additionally to said second timeslot when said measured number of pages is greater than said predetermined threshold value.
2. The fixed base-site of claim 1 wherein said means for assigning further comprises means for assigning said paging signal to at least each of said repetitive timeslots.
3. The fixed base-site of claim 1 wherein said means for providing a predetermined time difference value further comprises means for providing a predetermined queue length value.
4. The fixed base-site of claim 3 wherein said means for receiving further comprises means for generating a queue for said at least one paging request.
5. The fixed base-site of claim 4 wherein said means for generating a queue further comprises means for determining the length of said queue.
6. The fixed base-site of claim 5 wherein said means for determining further comprises means for measuring relative to the number of pages said means for receiving receives, for measuring the number of pages having said determined queue length greater than said predetermined queue length value.
7. The fixed base-site of claim 6 wherein said means for assigning said generated paging signal additionally to said second timeslot further comprises means for assigning said generated paging signal additionally to said second timeslot when said measured number of pages having said determined queue length greater than said predetermined queue length value is greater than said predetermined threshold value.
8. The fixed base-site of claim 7 wherein said means for assigning further comprises means for assigning said paging signal to at least each of said repetitive timeslots.
9. A radiotelephone system incorporating a fixed base-site coupled to an external interface wherein the external interface periodically sends a paging request to the fixed base-site to request the fixed base-site to establish a communication link to a subscriber out of a plurality of subscribers, the radiotelephone system comprising:
means, at the fixed base-site, for providing a plurality of repetitive timeslots, including at least first and second timeslots;
means, at the fixed base-site, for providing a predetermined time difference value and a predetermined threshold value;
means, at the external interface, for sending the paging request;
means, at the fixed base-site, for receiving the paging request from the external interface;
means, at the fixed base-site, for generating a paging signal in response to said receiving a paging request;
means, at the fixed base-site, for assigning said generated paging signal to said first timeslot;
means, at the fixed base-site and responsive to said means for assigning, for transmitting said paging signal to the one subscriber;
means, at the subscriber, for acknowledging said transmission of said paging signal;
means, at the fixed base-site, for determining a time difference between a time when said means for receiving receives the paging request and a time when said means for transmitting transmits said one paging signal; and means, responsive to said means for determining, for measuring, relative to the number of pages said means for receiving receives, the number of pages having said determined time difference greater than said predetermined time difference value; and means, at the fixed base-site and responsive to said means for measuring, for assigning said generated paging signal additionally to said second timeslot when said measured number of pages is greater than said predetermined threshold value.
means, at the fixed base-site, for providing a plurality of repetitive timeslots, including at least first and second timeslots;
means, at the fixed base-site, for providing a predetermined time difference value and a predetermined threshold value;
means, at the external interface, for sending the paging request;
means, at the fixed base-site, for receiving the paging request from the external interface;
means, at the fixed base-site, for generating a paging signal in response to said receiving a paging request;
means, at the fixed base-site, for assigning said generated paging signal to said first timeslot;
means, at the fixed base-site and responsive to said means for assigning, for transmitting said paging signal to the one subscriber;
means, at the subscriber, for acknowledging said transmission of said paging signal;
means, at the fixed base-site, for determining a time difference between a time when said means for receiving receives the paging request and a time when said means for transmitting transmits said one paging signal; and means, responsive to said means for determining, for measuring, relative to the number of pages said means for receiving receives, the number of pages having said determined time difference greater than said predetermined time difference value; and means, at the fixed base-site and responsive to said means for measuring, for assigning said generated paging signal additionally to said second timeslot when said measured number of pages is greater than said predetermined threshold value.
10. The fixed base-site of claim 9 wherein said means for assigning further comprises means for assigning said paging signal to each of said repetitive timeslots.
11. The fixed base-site of claim 9 wherein said means for providing a predetermined time difference value further comprises means for providing a predetermined queue length value.
12. The fixed base-site of claim 11 wherein said means for receiving further comprises means for generating a queue for said at least one paging request.
13. The fixed base-site of claim 12 wherein said means for generating a queue further comprises means for determining the length of said queue.
14. The fixed base-site of claim 13 wherein said means for determining further comprises means for measuring, relative to the number of pages said means for receiving receives, for measuring the number of pages having said determined queue length greater than said predetermined queue length value.
15. The fixed base-site of claim 14 wherein said means for assigning said generated paging signal additionally to said second timeslot further comprises means for assigning said generated paging signal additionally to said second timeslot when said measured number of pages having said determined queue length greater than said predetermined queue length value is greater than said predetermined threshold value.
16. The fixed base-site of claim 15 wherein said means for assigning further comprises means for assigning said paging signal to each of said repetitive timeslots.
17. A method of paging incorporating a fixed basesite coupled to an external interface in a radiotelephone system, wherein the external interface periodically sends a paging request to request the fixed base-site to page individually a plurality of subscribers, the method comprising the steps of:
providing a plurality of repetitive timeslots, including at least first and second timeslots;
providing a predetermined time difference value and a predetermined threshold value;
receiving a paging request from the external interface;
generating a paging signal in response to said receiving a paging request;
assigning said generated paging signal to said first timeslot;
transmitting, responsive to said means for assigning, said paging signal to at least one subscriber;
determining a time difference between a time when said means for receiving receives said one paging request and a time when said step of transmitting transmits said one paging signal; and measuring, responsive to said step of determining and relative to the number of pages said step of receiving receives, the number of pages having saiddetermined time difference greater than said predetermined time difference value;
and assigning, responsive to said means for measuring, said generated paging signal additionally to said second timeslot when said measured number of pages is greater than said predetermined threshold value.
providing a plurality of repetitive timeslots, including at least first and second timeslots;
providing a predetermined time difference value and a predetermined threshold value;
receiving a paging request from the external interface;
generating a paging signal in response to said receiving a paging request;
assigning said generated paging signal to said first timeslot;
transmitting, responsive to said means for assigning, said paging signal to at least one subscriber;
determining a time difference between a time when said means for receiving receives said one paging request and a time when said step of transmitting transmits said one paging signal; and measuring, responsive to said step of determining and relative to the number of pages said step of receiving receives, the number of pages having saiddetermined time difference greater than said predetermined time difference value;
and assigning, responsive to said means for measuring, said generated paging signal additionally to said second timeslot when said measured number of pages is greater than said predetermined threshold value.
18. The method of claim 17 wherein said step of assigning further comprises the step of assigning said paging signal to at least each of said repetitive timeslots.
19. The method of claim 17 wherein said step of providing a predetermined time difference value further comprises the step of providing a predetermined queue length value.
20. The method of claim 19 wherein said step of receiving further comprises the step of generating a queue for said at least one paging request.
21. The method of claim 20 wherein said step of generating a queue further comprises the step of determining the length of said queue.
22. The method of claim 21 wherein said step of determining further comprises the step of measuring, relative to the number of pages said step of receiving receives, for measuring the number of pages having said determined queue length greater than said predetermined queue length value.
23. The method of claim 22 wherein said step of assigning said generated paging signal additionally to said second timeslot further comprises the step of assigning said generated paging signal additionally to said second timeslot when said measured number of pages having said determined queue length greater than said predetermined queue length value is greater than said predetermined threshold value.
24. The method of claim 23 wherein said step of assigning further comprises the step of assigning said paging signal to at least each of said repetitive timeslots.
25. A method of paging in a radiotelephone system incorporating a fixed base-site coupled to an external interface wherein the external interface periodically sends a paging request to the fixed base-site to request the fixed base-site to establish a communication link to one of a plurality of subscribers, the method comprising the steps of:
providing, at the fixed base-site, a plurality of repetitive timeslots, including at least first and second timeslots;
providing, at the fixed base-site, a predetermined time difference value and a predetermined threshold value;
sending, at the external interface, the paging request;
receiving, at the fixed base-site, the paging request from the external interface;
generating, at the fixed base-site, a paging signal in response to said receiving a paging request;
generating, at the fixed base-site, said generated paging signal to said first timeslot;
transmitting, at the fixed base-site and responsive to said step of assigning, said paging signal to the one subscriber;
acknowledging, at the one subscriber unit, said transmission of said paging signal;
determining, at the fixed base-site, a time difference between a time when said step of receiving receives the paging request and a time when said step of transmitting transmits said one paging signal; and measuring, at the fixed base-site, responsive to said step of determining and relative to the number of pages said step of receiving receives, the number of pages having said determined time difference greater than said predetermined time difference value; and assigning, at the fixed base-site and responsive to said means for measuring, said generated paging signal additionally to said second timeslot when said measured number of pages is greater than said predetermined threshold value.
providing, at the fixed base-site, a plurality of repetitive timeslots, including at least first and second timeslots;
providing, at the fixed base-site, a predetermined time difference value and a predetermined threshold value;
sending, at the external interface, the paging request;
receiving, at the fixed base-site, the paging request from the external interface;
generating, at the fixed base-site, a paging signal in response to said receiving a paging request;
generating, at the fixed base-site, said generated paging signal to said first timeslot;
transmitting, at the fixed base-site and responsive to said step of assigning, said paging signal to the one subscriber;
acknowledging, at the one subscriber unit, said transmission of said paging signal;
determining, at the fixed base-site, a time difference between a time when said step of receiving receives the paging request and a time when said step of transmitting transmits said one paging signal; and measuring, at the fixed base-site, responsive to said step of determining and relative to the number of pages said step of receiving receives, the number of pages having said determined time difference greater than said predetermined time difference value; and assigning, at the fixed base-site and responsive to said means for measuring, said generated paging signal additionally to said second timeslot when said measured number of pages is greater than said predetermined threshold value.
26. The method of claim 25 wherein said step of assigning further comprises the step of assigning said paging signal to each of said repetitive timeslots.
27. The method of claim 25 wherein said step of providing a predetermined time difference value further comprises the step of providing a predetermined queue length value.
28. The method of claim 25 wherein said step of receiving further comprises the step of generating a queue for said at least one paging request.
29. The method of claim 28 wherein said step of generating a queue further comprises the step of determining the length of said queue.
30. The method of claim 29 wherein said step of determining further comprises the step of measuring, relative to the number of pages said step of receiving receives, for measuring the number of pages having said determined queue length greater than said predetermined queue length value.
31. The method of claim 30 wherein said step of assigning said generated paging signal additionally to said second timeslot further comprises the step of assigning said generated paging signal additionally to said second timeslot when said measured number of pages having said determined queue length greater than said predetermined queue length value is greater than said predetermined threshold value.
32. The method of claim 31 wherein said step of assigning further comprises the step of assigning said paging signal to each of said repetitive timeslots.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US61774990A | 1990-11-26 | 1990-11-26 | |
| US07/617,749 | 1990-11-26 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2096832A1 CA2096832A1 (en) | 1992-05-27 |
| CA2096832C true CA2096832C (en) | 1996-08-20 |
Family
ID=24474901
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002096832A Expired - Fee Related CA2096832C (en) | 1990-11-26 | 1991-11-25 | Method and apparatus for paging in a communication system |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US5373506A (en) |
| EP (1) | EP0559776A1 (en) |
| JP (1) | JPH06502973A (en) |
| KR (1) | KR0125765B1 (en) |
| AU (1) | AU655219B2 (en) |
| CA (1) | CA2096832C (en) |
| WO (1) | WO1992010042A1 (en) |
Families Citing this family (68)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20010050943A1 (en) * | 1989-08-03 | 2001-12-13 | Mahany Ronald L. | Radio frequency communication network having adaptive communication parameters |
| US7606575B2 (en) * | 1988-08-04 | 2009-10-20 | Broadcom Corporation | Remote radio data communication system with data rate switching |
| US6374311B1 (en) * | 1991-10-01 | 2002-04-16 | Intermec Ip Corp. | Communication network having a plurality of bridging nodes which transmit a beacon to terminal nodes in power saving state that it has messages awaiting delivery |
| US7415548B2 (en) | 1991-05-13 | 2008-08-19 | Broadcom Corporation | Communication network having a plurality of bridging nodes which transmits a polling message with backward learning technique to determine communication pathway |
| US7558557B1 (en) | 1991-11-12 | 2009-07-07 | Broadcom Corporation | Low-power messaging in a network supporting roaming terminals |
| US6407991B1 (en) | 1993-05-06 | 2002-06-18 | Intermec Ip Corp. | Communication network providing wireless and hard-wired dynamic routing |
| EP0606396B1 (en) * | 1991-10-01 | 2002-06-12 | Norand Corporation | A radio frequency local area network |
| US6041047A (en) * | 1992-10-05 | 2000-03-21 | Telefonaktiebolaget Lm Ericsson | Digital control channels having logical channels supporting broadcast SMS |
| US5603081A (en) * | 1993-11-01 | 1997-02-11 | Telefonaktiebolaget Lm Ericsson | Method for communicating in a wireless communication system |
| US5604744A (en) | 1992-10-05 | 1997-02-18 | Telefonaktiebolaget Lm Ericsson | Digital control channels having logical channels for multiple access radiocommunication |
| US7917145B2 (en) | 1992-11-02 | 2011-03-29 | Broadcom Corporation | Radio frequency local area network |
| GB2278977B (en) * | 1993-06-10 | 1997-05-28 | Roke Manor Research | Improvements in or relating to cellular mobile radio systems |
| US6331971B1 (en) | 1993-11-01 | 2001-12-18 | Telefonaktiebolaget Lm Ericsson (Publ) | Enhanced sleep mode in radiocommunication systems |
| AU681721B2 (en) * | 1993-11-01 | 1997-09-04 | Alex K. Raith | Enhanced sleep mode in radiocommunication systems |
| JPH08508627A (en) * | 1993-11-01 | 1996-09-10 | テレフオンアクチーボラゲツト エル エム エリクソン | Layer 2 protocol in a cellular communication system |
| US5826172A (en) * | 1994-02-03 | 1998-10-20 | Ntt Mobile Communications Network, Inc. | Mobile communications system for repeatedly transmitting paging signals |
| GB9418772D0 (en) * | 1994-09-16 | 1994-11-02 | Ionica L3 Limited | Digital telephony |
| US6175557B1 (en) | 1994-10-31 | 2001-01-16 | Telefonaktiebolaget Lm Ericsson (Publ) | Layer 2 protocol in a cellular communication system |
| US5745860A (en) * | 1994-12-16 | 1998-04-28 | Telefonaktiebolaget Lm Ericsson | Method and system of data transmission and reception in a mobile station within a radio telecommunications system |
| AU5848896A (en) * | 1995-05-23 | 1996-12-11 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and apparatus for supporting delivery of short messag e service messages to sleeping mobile stations in a cellular communications system |
| US6711418B1 (en) * | 1995-10-13 | 2004-03-23 | General Wireless Communications Inc. | Wireless personal mobile data terminal receiving a wide-area broadcast and capable of two-way communication in a local area |
| US5898904A (en) * | 1995-10-13 | 1999-04-27 | General Wireless Communications, Inc. | Two-way wireless data network having a transmitter having a range greater than portions of the service areas |
| JP3629077B2 (en) * | 1995-12-08 | 2005-03-16 | 富士通株式会社 | Wireless communication system, base station for wireless communication system, and intermittent power-on type mobile station |
| FI103246B (en) | 1996-02-06 | 1999-05-14 | Nokia Telecommunications Oy | Method and arrangement for limiting call load in a mobile communication system |
| US6138001A (en) * | 1996-03-12 | 2000-10-24 | Ntt Mobile Communications Network, Inc. | Scheme for intermittent reception of paging signals in mobile communication system |
| US5854784A (en) * | 1996-11-05 | 1998-12-29 | Ericsson, Inc. | Power-saving method for providing synchronization in a communications system |
| US5978379A (en) | 1997-01-23 | 1999-11-02 | Gadzoox Networks, Inc. | Fiber channel learning bridge, learning half bridge, and protocol |
| DE19831345C2 (en) * | 1998-07-13 | 2002-01-24 | Siemens Ag | Method and radio communication system for calling a mobile station |
| US7430171B2 (en) | 1998-11-19 | 2008-09-30 | Broadcom Corporation | Fibre channel arbitrated loop bufferless switch circuitry to increase bandwidth without significant increase in cost |
| US6424177B1 (en) | 1999-06-28 | 2002-07-23 | Broadcom Corporation | Universal single-ended parallel bus |
| US6897697B2 (en) | 1999-06-28 | 2005-05-24 | Broadcom Corporation | Current-controlled CMOS circuit using higher voltage supply in low voltage CMOS process |
| US6424194B1 (en) | 1999-06-28 | 2002-07-23 | Broadcom Corporation | Current-controlled CMOS logic family |
| US6911855B2 (en) | 1999-06-28 | 2005-06-28 | Broadcom Corporation | Current-controlled CMOS circuit using higher voltage supply in low voltage CMOS process |
| GB2359458A (en) * | 2000-02-18 | 2001-08-22 | Motorola Israel Ltd | A battery operated mobile telephone wherein receiving slots of a channel are skipped in idle mode and a communication circuit de energised |
| US6340899B1 (en) | 2000-02-24 | 2002-01-22 | Broadcom Corporation | Current-controlled CMOS circuits with inductive broadbanding |
| US6805751B2 (en) * | 2000-07-24 | 2004-10-19 | Alkansas State University | Method and apparatus for removal of minute particles from a surface using thermophoresis to prevent particle redeposition |
| US6650873B2 (en) * | 2000-10-19 | 2003-11-18 | Qualcomm, Incorporated | Techniques for adjusting parameters of a quick paging channel based on network load |
| US6823192B2 (en) * | 2001-01-12 | 2004-11-23 | Qualcomm Incorporated | Method and apparatus for quick paging in a wireless communication system |
| US6864558B2 (en) | 2001-05-17 | 2005-03-08 | Broadcom Corporation | Layout technique for C3MOS inductive broadbanding |
| US20020173315A1 (en) * | 2001-05-17 | 2002-11-21 | Mazen Chmaytelli | Method and apparatus for adapting capabilities of a wireless communication system to load requirements |
| US7239636B2 (en) | 2001-07-23 | 2007-07-03 | Broadcom Corporation | Multiple virtual channels for use in network devices |
| US6624699B2 (en) | 2001-10-25 | 2003-09-23 | Broadcom Corporation | Current-controlled CMOS wideband data amplifier circuits |
| EP1317156A1 (en) * | 2001-11-28 | 2003-06-04 | Alcatel | Method of operating a mobile station in an energy saving mode |
| SE0200106D0 (en) * | 2002-01-14 | 2002-01-14 | Ericsson Telefon Ab L M | A method and arrangement for paging in a mobile telecommunication system |
| US7295555B2 (en) | 2002-03-08 | 2007-11-13 | Broadcom Corporation | System and method for identifying upper layer protocol message boundaries |
| WO2003105519A1 (en) * | 2002-06-05 | 2003-12-18 | 株式会社エヌ・ティ・ティ・ドコモ | Server, mobile communication system, positional information managing method, radio base station, mobile station, method for calling in mobile communication system, and mobile communication method |
| ATE467328T1 (en) | 2002-08-01 | 2010-05-15 | Interdigital Tech Corp | METHOD FOR COORDINATING RADIO CALLING EVENTS ON A COMMON RADIO CALLING CHANNEL |
| US7346701B2 (en) | 2002-08-30 | 2008-03-18 | Broadcom Corporation | System and method for TCP offload |
| US7934021B2 (en) | 2002-08-29 | 2011-04-26 | Broadcom Corporation | System and method for network interfacing |
| US7313623B2 (en) | 2002-08-30 | 2007-12-25 | Broadcom Corporation | System and method for TCP/IP offload independent of bandwidth delay product |
| EP1554842A4 (en) | 2002-08-30 | 2010-01-27 | Corporation Broadcom | System and method for handling out-of-order frames |
| US8180928B2 (en) | 2002-08-30 | 2012-05-15 | Broadcom Corporation | Method and system for supporting read operations with CRC for iSCSI and iSCSI chimney |
| ATE469484T1 (en) * | 2002-12-31 | 2010-06-15 | Motorola Inc | SYSTEM AND METHOD FOR POWER CONTROL IN A WIRELESS CLIENT DEVICE |
| US7610035B2 (en) | 2002-12-31 | 2009-10-27 | Temic Automotive Of North America, Inc. | System and method for controlling the power in a wireless client device |
| US7596366B2 (en) | 2002-12-31 | 2009-09-29 | Temic Automotive Of North America, Inc. | System and method for controlling the power in a wireless client device |
| US20050032555A1 (en) * | 2003-08-07 | 2005-02-10 | Iqbal Jami | Method of intermittent activation of receiving circuitry of a mobile user terminal |
| US7796995B2 (en) * | 2004-06-21 | 2010-09-14 | Qualcomm Incorporated | Asynchronous signaling and data delivery in wireless communication system |
| EP1610574A1 (en) * | 2004-06-25 | 2005-12-28 | Groundhog Technologies Inc. | Partitioning method for mobile communication network with overlapping location areas |
| US7598811B2 (en) | 2005-07-29 | 2009-10-06 | Broadcom Corporation | Current-controlled CMOS (C3MOS) fully differential integrated wideband amplifier/equalizer with adjustable gain and frequency response without additional power or loading |
| US7362174B2 (en) | 2005-07-29 | 2008-04-22 | Broadcom Corporation | Current-controlled CMOS (C3MOS) wideband input data amplifier for reduced differential and common-mode reflection |
| US7598788B2 (en) | 2005-09-06 | 2009-10-06 | Broadcom Corporation | Current-controlled CMOS (C3MOS) fully differential integrated delay cell with variable delay and high bandwidth |
| KR100648067B1 (en) * | 2005-12-10 | 2006-11-23 | 한국전자통신연구원 | Method for adaptive discontinuous reception based on extended paging indicator for improvement of power effective performance at mobile terminal on wcdma |
| TW201536084A (en) | 2006-03-24 | 2015-09-16 | Interdigital Tech Corp | Proving discontinuous reception (DRX) and measurement reporting in a wireless network |
| CA2817781C (en) | 2010-11-15 | 2019-02-26 | Research In Motion Limited | Managing communications across a wireless network using discontinuous reception |
| US8611240B2 (en) | 2010-11-15 | 2013-12-17 | Blackberry Limited | Managing wireless communications |
| US8654691B2 (en) * | 2010-11-15 | 2014-02-18 | Blackberry Limited | Managing wireless communications |
| US9451487B2 (en) * | 2014-06-05 | 2016-09-20 | Mediatek Inc. | Method for adaptively monitoring paging messages with reduced power consumption and communications apparatuses utilizing the same |
| US9622289B2 (en) * | 2014-06-20 | 2017-04-11 | Apple Inc. | End-to-end delay adaptation with connected DRX in a cellular voice call |
Family Cites Families (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2110850B (en) * | 1981-11-30 | 1985-12-18 | Multitone Electronics Plc | Radiopaging arrangements |
| US4745408A (en) * | 1983-04-09 | 1988-05-17 | Nec Corporation | Radio paging system and receiver therefor |
| JPH0624337B2 (en) * | 1985-09-30 | 1994-03-30 | 日本電信電話株式会社 | Incoming signal transmission method of wireless telephone device |
| US4794635A (en) * | 1986-11-28 | 1988-12-27 | Motorola, Inc. | Two-way radio communication system with max-minimum call assignment method |
| EP0347410A1 (en) * | 1987-01-02 | 1989-12-27 | Motorola, Inc. | Paging system with assignable battery saver duty cycle |
| US4868562A (en) * | 1988-02-22 | 1989-09-19 | Telefind Corp. | Paging system |
| US4866431A (en) * | 1988-02-22 | 1989-09-12 | Telefind Corp. | Paging system hub switch |
| US4866710A (en) * | 1988-02-22 | 1989-09-12 | Motorola, Inc. | Reuse groups for scan monitoring in digital cellular systems |
| US5029163A (en) * | 1988-03-18 | 1991-07-02 | At&T Bell Laboratories | Synchronous protocol data formatter |
| US4914649A (en) * | 1988-09-12 | 1990-04-03 | Motorola, Inc. | Multiple frequency message system |
| US5150361A (en) * | 1989-01-23 | 1992-09-22 | Motorola, Inc. | Energy saving protocol for a TDM radio |
| US5072444A (en) * | 1989-10-23 | 1991-12-10 | Motorola, Inc. | Central controller with adaptive message handling characteristics |
| GB2241851A (en) * | 1990-03-09 | 1991-09-11 | Philips Electronic Associated | Optimising transmitter power in a communications system |
| US5014314A (en) * | 1990-04-27 | 1991-05-07 | Motorola, Inc. | Method for developing and transmitting usage context information in an RF communication system |
| US5239545A (en) * | 1990-11-05 | 1993-08-24 | Motorola, Inc. | Channel access control in a communication system |
| JPH1149622A (en) * | 1997-08-04 | 1999-02-23 | Japan Tobacco Inc | Cockroach repellent |
| JP2010074026A (en) * | 2008-09-22 | 2010-04-02 | Toshiba Corp | Exposure method and semiconductor device |
-
1991
- 1991-11-25 KR KR1019930701557A patent/KR0125765B1/en not_active IP Right Cessation
- 1991-11-25 AU AU91054/91A patent/AU655219B2/en not_active Ceased
- 1991-11-25 CA CA002096832A patent/CA2096832C/en not_active Expired - Fee Related
- 1991-11-25 EP EP92901298A patent/EP0559776A1/en not_active Withdrawn
- 1991-11-25 JP JP4501572A patent/JPH06502973A/en active Pending
- 1991-11-25 WO PCT/US1991/008894 patent/WO1992010042A1/en not_active Application Discontinuation
-
1993
- 1993-07-09 US US08/088,598 patent/US5373506A/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| KR0125765B1 (en) | 1997-12-26 |
| US5373506A (en) | 1994-12-13 |
| EP0559776A4 (en) | 1994-03-23 |
| AU655219B2 (en) | 1994-12-08 |
| KR930702836A (en) | 1993-09-09 |
| AU9105491A (en) | 1992-06-25 |
| CA2096832A1 (en) | 1992-05-27 |
| EP0559776A1 (en) | 1993-09-15 |
| JPH06502973A (en) | 1994-03-31 |
| WO1992010042A1 (en) | 1992-06-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2096832C (en) | Method and apparatus for paging in a communication system | |
| JP4443056B2 (en) | Integration of different message types sent to mobile terminals in mobile communication systems | |
| EP1221821B1 (en) | Apparatus for use in paging mode in wireless communications systems | |
| US6760584B2 (en) | System for transmitting and receiving short message service (SMS) messages | |
| US7548519B2 (en) | Mobile communication system, mobile communication method, mobile terminal and base station | |
| KR100776847B1 (en) | A variable sleep mode for mobile stations in a mobile communications network | |
| KR101086842B1 (en) | Device and method for contrlling sleep mode in cellular system | |
| KR100514569B1 (en) | Methods and apparatus for generating timing signals in a radiocommunication unit | |
| US6330446B1 (en) | Velocity-based method of controlling registration in mobile communication systems | |
| KR100699291B1 (en) | Synchronization for extending battery life | |
| CN110839274B (en) | Grouping method of terminal equipment, related device and system | |
| JPH11275006A (en) | Method for sending information from base station to terminals, base station and terminal equipment | |
| CN101790896A (en) | User device, base station apparatus and method for use in mobile communication system | |
| CN101583178A (en) | Method and device for dynamically controlling discontinuous reception of UE | |
| EP1026910A1 (en) | Mobile radio station | |
| US7113783B2 (en) | System for transmitting and receiving short message service (SMS) messages | |
| CN101917755A (en) | Mobile terminal and power supply control method thereof | |
| CN111148144A (en) | RRM (radio resource management) measurement method and device | |
| NZ257420A (en) | Gsm cellular telephony: marking mobile as "switched off" after lack of paging response | |
| Xu et al. | A novel adaptive energy saving mode in IEEE 802.16 e system | |
| Li et al. | Radio Resource Management Measurement Relaxation on Reduced Capability New Radio Devices | |
| FI111203B (en) | Determining a reference value for AGC control of a receiver on a general packet control channel | |
| CN111918373A (en) | NB-IOT (network b-internet of things) -based low-power transmission method and device for Internet of things | |
| CN1988710B (en) | Method and system for controlling MAC state shifting | |
| JPH08172671A (en) | Mobile station calling method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed | ||
| MKLA | Lapsed |
Effective date: 20021125 |