CA2475859C - Transport block set transmission using hybrid automatic repeat request - Google Patents

Transport block set transmission using hybrid automatic repeat request Download PDF

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Publication number
CA2475859C
CA2475859C CA2475859A CA2475859A CA2475859C CA 2475859 C CA2475859 C CA 2475859C CA 2475859 A CA2475859 A CA 2475859A CA 2475859 A CA2475859 A CA 2475859A CA 2475859 C CA2475859 C CA 2475859C
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Prior art keywords
tbs
modulation
retransmitted
retransmission
subcarriers
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CA2475859A1 (en
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Stephen E. Terry
Nader Bolourchi
Ariela Zeira
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Intel Corp
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Intel Corp
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/0001Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0002Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • H04L1/0003Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/004Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0041Arrangements at the transmitter end
    • H04L1/0042Encoding specially adapted to other signal generation operation, e.g. in order to reduce transmit distortions, jitter, or to improve signal shape
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/004Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0045Arrangements at the receiver end
    • H04L1/0047Decoding adapted to other signal detection operation
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1822Automatic repetition systems, e.g. Van Duuren systems involving configuration of automatic repeat request [ARQ] with parallel processes
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829Arrangements specially adapted for the receiver end
    • H04L1/1835Buffer management
    • H04L1/1845Combining techniques, e.g. code combining
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867Arrangements specially adapted for the transmitter end
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867Arrangements specially adapted for the transmitter end
    • H04L1/1893Physical mapping arrangements
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0055Physical resource allocation for ACK/NACK
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/04Wireless resource allocation
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/20Control channels or signalling for resource management
    • H04W72/21Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/20Control channels or signalling for resource management
    • H04W72/23Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/0001Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0009Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding

Abstract

Data of a time transmission interval is to be transmitted in a wireless communication system. The wireless communication system uses adaptive modulation and coding and has automatic repeat request mechanism. A
transmission time interval has a plurality of transport block sets. The transport block sets are transmitted with a first specified modulation and coding scheme. Each transport block set is received and a determination is made as to whether the transport block sets meet a specified quality (50).
When the specified quality is not met, a repeat request is transmitted (51).
The specified modulation and coding scheme is changed to a second specified modulation and coding scheme that may support a reduced number of TBS's within the transmission time interval. In response to the repeat request, at least one of the transport block sets is retransmitted. The retransmitted transport block set is received. The retransmitted transport block set may be combined with a corresponding previously received transport block set (51).

Description

[0001] TRANSPORT BLOCK SET TRANSMISSION
USING HYBRID AUTOMATIC REPEAT REQUEST
[0002] BACKGROUND
[0003] This invention generally relates to wireless communication systems. In particular, the invention relates to transmission of data in such systems where adaptive modulation & coding (AMC) and hybrid automatic repeat request (H-ARQ) techniques are applied.
[0004] In wireless communication systems, such as the third generation partnership project (3GPP) time division duplex (TDD) or frequency division duplex (FDD) communication systems using code division multiple access (CDMA) or orthogonal frequency division multiplex (OFDM) systems, AMC is used to optimize the use of air resources.
[0005] The modulation and coding schemes (sets) used to transmit data are varied based on wireless channel conditions. To illustrate, a type of error encoding (such as turbo versus convolutional coding), coding rate, spreading factor for CDMA system, modulation type (such as quadrature phase shift keying versus M-ary quadrature amplitude modulation), and/or adding/subtracting sub-carriers for an OFDM system may change. If channel characteristics improve, a lower data redundancy and/or "less robust" modulation and coding set is used to transfer data. As a result, for a given allocation of radio resources, more user data is transferred resulting in a higher effective data rate. Conversely, if channel characteristics degrade, a higher data redundancy "more robust"
modulation and coding set is used, transferring less user data. Using AMC, an optimization between air resource utilization and quality of service (QOS) can be better maintained.
[0006] Data in such systems is received for transfer over the air interface in transmission time intervals (TTIs). Data within a TTI transferred to a particular user equipment is referred to as a transport block set (TBS). For a particular allocation of air resources, a less robust modulation and coding set allows for larger TBS sizes and a more robust modulation and coding set only allows for smaller TBS sizes. As a result, the modulation and coding set for a given radio resource allocation dictates the maximum size of the TBS that can be supported in a given TTI..
[0007] In such systems, a hybrid automatic repeat request (H-ARQ) mechanism may be used to maintain QOS and improve radio resource efficiency.
A system using H-ARQ is shown in Figure 1. A transmitter 20 transmits a TBS
over the air interface using a particular modulation and coding set. The TBS
is received by a receiver 26. An H-ARQ decoder 30 decodes the received TBS. If the quality of the received data is unacceptable, an ARQ transmitter 28 requests a retransmission of the TBS. One approach to check the quality of the received TBS is a cyclic redundancy check (CRC). An ARQ receiver 22 receives the request and a retransmission of the TBS is made by the transmitter 20.
Retransmissions may apply a more robust modulation and coding set to increase the possibility of successful delivery. The H-ARQ decoder 30 combines, the received TBS versions. A requirement for combining is that combined TBSs are identical. If the resulting quality is still insufficient, another retransmission is requested. If the resulting quality is sufficient, such as the combined TBS
passes the CRC check, the received TBS is released for further processing. The H-ARQ
mechanism allows for data received with unacceptable quality to be retransmitted to maintain the desired QOS.
[0008] In a system using both H-ARQ and AMC, a change in modulation and coding set may be determined necessary to achieve successful delivery of a requested TBS retransmission. In this situation, the maximum amount of physical data bits allowed within the TTI varies with the modulation and coding set.
[0009] Since only one TBS exists per TTI the effective user data rate corresponds to the TBS size applied to each TTI. To achieve maximum data rates the largest TBS size is applied to the least robust modulation and coding set within the TTI. When wireless channel conditions require a more robust modulation and coding set for successful transmission, such as when a TBS size can not be supported within the TTI. Therefore, when operating at the maximum data rate, each time a more robust modulation and coding requirement is realized, all outstanding transmissions in H-ARQ processes that have not been successfully acknowledged must be discarded.
[00010] When Incremental Redundancy (IR) is applied, TBS data must remain constant in retransmissions for proper combining. Therefore, to guarantee that a TBS retransmission can be supported at a more robust modulation and coding set then the initial transmission, the TBS size used must correspond to the most robust MCS. However, when a TBS size allowed by the most robust modulation and coding set is applied the maximum data rate to the mobile is reduced, and when a less robust modulation and coding set is applied physical resources are not fully utilized.
[00011] When the TBS size is not supported by the more robust modulation and coding set, the TBS can be retransmitted using the old modulation and coding set. However, if the channel conditions dictate that a more robust modulation and coding set be used or the initial transmission was severally corrupted, the combining of the retransmitted TBSs may never pass, resulting in a transmission failure.
[00012] In current implementations, when a TBS can not be successfully transmitted by AMC & H-ARQ mechanisms, recovery is handled by the radio link control (RLC) protocol (at layer two). Unlike a H-ARQ recovery of failed transmissions, the RLC error detection, data recovery and buffering of a TBS
queued in the node-B, results in increased block error rates and data latency, potentially resulting in a failure to meet QOS requirements.
[00013] Accordingly, to provide maximum data rates with minimal H-ARQ
transmission failures, it is desirable to support incremental redundancy and allow adaptation of modulation and coding sets in such systems.
[00014] SUMMARY
[00015] Data is to be transmitted in a wireless communication system within a transmission time interval. The wireless communication system uses adaptive modulation and coding and has automatic repeat request mechanism. A

transmission time interval has a plurality of transport block sets. The transport block sets are transmitted with a first specified modulation and coding scheme. Each transport block set is received and a determination is made as to whether the transport block sets meet a specified quality. When the specified quality is not met, a repeat request is transmitted. The specified modulation and coding scheme is changed to a second specified modulation and coding scheme that may support a reduced number of TBS's within the transmission time interval. In response to the repeat request, at least one of the transport block sets is retransmitted. The retransmitted transport block set is received. The retransmitted transport block set may be combined with a corresponding previously received transport block set.

[0015a] According to an embodiment of the present disclosure there is provided A
user equipment (UE) comprisingat least one receiver and a processor configured to receive a plurality of transport blocks (TBs) in a first transmission time interval (TTI) on a first set of subcarriers; at least one transmitter and the processor configured to generate a negative acknowledgement (NACK) in response to a determination that one of the plurality of TBs requires retransmission; the at least one receiver and the processor further configured to receive a retransmitted one of the plurality of TBs in a second TTI on a second set of subcarriers, wherein the first set of subcarriers and the second set of subcarriers are different; and the processor further configured to combine the one of the plurality of TBs that required retransmission with the retransmitted one of the plurality of TBs.

[0015b] According to another embodiment of the present disclosure there is provided a method of wireless communication comprising receiving a plurality of transport blocks (TBs) in a first transmission time interval (TTI) using a first number of subcarriers; generating a negative acknowledgement (NACK) in response to a determination that one of the plurality of TBs requires retransmission; receiving a retransmitted one of the plurality of TBs in a second TTI using a second number of subcarriers; and combining the one of the plurality of TBs that required retransmission with the retransmitted one of the plurality of TBs.
[00016] BRIEF DESCRIPTION OF THE DRAWING(S)
[00017] Figure 1 is an embodiment of a wireless H-ARQ communication system.
[00018] Figures 2A-2D are illustrations of a TTI having multiple TBSs.
[00019] Figures 3A-3C are embodiments of a wireless H-ARQ communication system using AMC with TTIs capable of having multiple TBSs.
[00020] Figure 4 is a flow chart of changing the modulation and coding set prior to a H-ARQ retransmission.
[00021] Figure 5 is an illustration of changing the modulation and coding set prior to a retransmission of a single TBS.
[00022] Figure 6 is an illustration of changing the modulation and coding set prior to a retransmission of all three TBSs.

-5a-
[00023] Figure 7 is an illustration of overlapping TBSs in a TDD/CDMA
communication system.
[00024] Figure 8 is an illustration of non-overlapping TBSs in a TDD/CDMA
communication system.
[00025] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT(S)
[00026] Figures 2A, 2B, 2C and 2D illustrate a TTI having multiple TBSs, TBS1 to TBSN. Figure 2A illustrates multiple TBSs dividing a TTI by time, such as for use in a TDD/CDMA system. Figure 2B illustrates multiple TBSs divided by codes, such as for use in a FDD/CDMA or TDD/CDMA system. Figure 2C
illustrates dividing multiple TBSs by time and codes, such as for use in TDD/CDMA system. Figure 2D illustrates dividing multiple TBSs by sub-carriers, such as for use in an OFDM system. Each TBS is sized to allow transmission with the most robust modulation coding set for the allocated resources. To illustrate, the most robust MCS may only have the capacity to support a maximum 2,000 bit TBS within the TTI. Although referred to as the most robust modulation coding set, in practice, the most robust set may actually be a more robust set, if the most robust modulation coding set is unlikely to be needed. The least robust modulation and coding set may have the capacity to support a maximum of 20,000 bit TBS within the TTI. Although referred to as the least robust modulation coding set, in practice, the least robust set may actually be a less robust set, if the least robust modulation coding set is unlikely to be needed.
[00027] The TBS is sized, preferably, to allow for transmission with the most robust modulation and coding set within a TTI. Then when the least robust modulation and coding set is applied, multiple TBSs of this size are applied within the TTI to achieve maximum data rates, and when greater transmission reliability is required for successful delivery the most robust modulation and coding set can be applied.
[00028] Figure 3A is a simplified diagram of a transmitter 44 and receiver 46 for transmitting a TTI having one or multiple TBSs. The transmitter 44 may be located at either a user equipment or a base station/Node-B. The receiver 46 may be located at either a base station/Node-B or a user equipment. In current system implementations, AMC is typically only used in the downlink.
Accordingly, the preferred implementation of transmission is for use in supporting AMC for the downlink. For other systems using AMC in the uplink, transport block set transmission can be applied to the uplink.
[00029] A transmitter 301 to 30N (30) transmits each TBS, TBS1 to TBSN, over the air interface 36. The number of TBSs in the TTI depends on the TBS size and the modulation and coding set used for transmission. If the most robust modulation and coding set is used to ensure successful delivery, the TTI may only support one TBS. If a lesser robust modulation and coding set is used to achieve higher effective data rates, multiple TBSs are sent in the TTI. Alternately, some TBSs may be destined for a different receiver 461 to 46K (46), as shown in Figure 3B. Each TBS may also be sent to a different receiver 461 to 46N (46), as shown in Figure 3C. This flexibility allows for greater radio resource utilization and efficiency.
[00030] A receiver 381 to 38N (38) receives each transmitted TBS. A H-ARQ
decoder 421 to 42N (42) decodes each received TBS. Although in Figure 3 one transmitter 30, receiver 38 and H-ARQ decoder 42 is shown for each TBS, one transmitter 30, receiver 38 and H-ARQ decoder 42 may handle all the TBSs. For each TBS failing the quality test, a request for retransmission is made by the ARQ transmitter 40. An ARQ receiver 32 receives the request and directs the appropriate TBS(s) to be retransmitted. The retransmitted TBS(s) are combined by the H-ARQ decoder(s) 42 and another quality test is performed. Once the TBS(s) passes the quality test, it is released for further processing. Since a TTI
can contain multiple TBSs, preferably, a failure in one TBS does not necessarily require retransmission of the entire TTI, which more efficiently utilizes the radio resources.
[00031] An AMC controller 34 is also shown in Figures 3A, 3B and 3C. If the channel conditions change, the AMC controller may initiate a change in the modulation and code set used to transfer data. Figure 4 is a flow diagram illustrating such a change occurring in AMC between retransmissions. A TTI is transmitted having multiple TBSs and afterwards, a change in the modulation and coding set occurs, (step 50). To illustrate using Figure 5, a TTI has three TBSs, TBS1, TBS2 and TBS3 applied at the least robust modulation and coding set to achieve the maximum data rate. The modulation and coding set in Figure changes so that only one TBS can be transmitted subsequently. Referring back to Figure 4, at least one of the TBSs is received with an unacceptable quality and a retransmission is required, (step 52). In the illustration of Figure 5, TBS2 requires retransmission, as shown by a large "X". The TBS requiring retransmission is sent at the new modulation and coding set and combined with the prior TBS transmission, (step 54). As shown in Figure 5, only TBS2 is retransmitted and it is combined with the prior TBS2 transmission. Although this example illustrates sending only one TBS at the more robust modulation and coding set, it is also possible that two TBSs could be transmitted with the more robust modulation and coding set within the TTI.
[00032] Figure 6 is an illustration of multiple TBSs requiring retransmission.
Three TBSs, TBS1, TBS2 and TBS3, are transmitted in a TTI. A change in the modulation and coding set occurs such that only one TBS can be sent at a time.
All three TBSs are received with an unacceptable quality. A request for retransmission is sent for all three TBSs. Sequentially, each TBS is retransmitted, as shown by retransmission 1, retransmission 2 and retransmission 3 in separate TTIs. The retransmitted TBSs are combined with the prior transmissions. A similar procedure is used, if two TBSs are transmitted with the more robust modulation and coding set within the TTI.
[00033] As illustrated, multiple TBSs allow for maximum data rates and incremental redundancy. A TTI can be transmitted at the least robust modulation and coding set achieving the maximum data rate and subsequent H-ARQ retransmission can be made at a more robust modulation and coding set ensuring greater probability for successful transmission. By allowing incremental redundancy, radio resources can be used more aggressively. A more aggressive (less robust) modulation and coding set can be used to achieve higher data rates and radio resource efficiency, since transmission can be made using a more conservative (more robust) set to maintain QOS, if channel conditions degrade.
[00034] In a TDD/CDMA communication system, such as in the 3GPP system, two preferred approaches for implementing multiple TBSs within a TTI use either overlapping or non-overlapping time slots. In overlapping time slots, the TBSs may overlap in time. As illustrated in Figure 7, a first TBS in a TTI
uses the resource units having an "A" in them. A resource unit is the use of one code in a time slot. A second TBS has the "B" resource units. As shown in Figure 7, in the second time slot, both the first and second TBS are transmitted.
Accordingly, the two TBSs' transmissions overlap in time.
[00035] In non-overlapping TBSs, each time slot only contains one TBS of a TTI. As illustrated in Figure 8, a first TBS ("A") is the only TBS in slots one and two. The second TBS ("B") is the only TBS in slots three and four.
[00036] In a FDD/CDMA communication system, such as in the third generation partnership project proposed system, transmissions occur simultaneously. In a FDD/CDMA system, preferably each TBS is assigned a different code/frequency pair for transmission. In an OFDM system, preferably each TBS is assigned a separate sub-carrier for transmission.

Claims (16)

What is claimed is:
1. A user equipment (UE) comprising:
at least one receiver and a processor configured to receive a plurality of transport blocks (TBs) in a first transmission time interval (TTI) on a first set of subcarriers;
at least one transmitter and the processor configured to generate a negative acknowledgement (NACK) in response to a determination that one of the plurality of TBs requires retransmission;
the at least one receiver and the processor further configured to receive a retransmitted one of the plurality of TBs in a second TTI on a second set of subcarriers, wherein the first set of subcarriers and the second set of subcarriers are different; and the processor further configured to combine the one of the plurality of TBs that required retransmission with the retransmitted one of the plurality of TBs.
2. The UE of claim 1, wherein the transmitter and the processor are further configured to transmit an acknowledgement (ACK) in response to a determination that one of the plurality of TBs does not require retransmission.
3. The UE of claim 1, wherein the processor is configured to combine the one of the plurality of TBs that required retransmission with the retransmitted one of the plurality of TBs using incremental redundancy.
4. The UE of claim 1, wherein each TB of the plurality of TBs has a different modulation and coding scheme (MCS).
5. The UE of claim 1, wherein each TB of the plurality of TBs has a respective modulation and coding scheme (MCS) that includes M-ary quadrature amplitude modulation (QAM) or quadrature phase shift keying (QPSK).
6. The UE of claim 1, wherein the retransmitted one of the plurality of TBs has a modulation and coding scheme (MCS) that is different than an MCS of the one of the plurality of TBs that required retransmission.
7. The UE of claim 1, wherein the at least one receiver is further configured to receive each TB of the plurality of TBs on different subcarriers of the first set of subcarriers.
8. The UE of claim 1, wherein the processor includes at least one hybrid automatic repeat request (HARQ) entity for each of the at least one receivers.
9. A method of wireless communication comprising:
receiving a plurality of transport blocks (TBs) in a first transmission time interval (TTI) using a first number of subcarriers;
generating a negative acknowledgement (NACK) in response to a determination that one of the plurality of TBs requires retransmission;
receiving a retransmitted one of the plurality of TBs in a second TTI using a second number of subcarriers; and combining the one of the plurality of TBs that required retransmission with the retransmitted one of the plurality of TBs.
10. The method of claim 9, further comprising:
generating an acknowledgement (ACK) in response to a determination that one of the plurality of TBs does not require retransmission.
11. The method of claim 9, wherein the combining one of the plurality of TBs that required retransmission with the retransmitted one of the plurality of TBs is done using incremental redundancy.
12. The method of claim 9 further comprising*
initiating a radio link control (RLC) recovery of at least one of the TBs, in response to a determination that one of the plurality of TBs require retransmission.
13. The method of claim 9, wherein each TB of the plurality of TBs has a different modulation and coding scheme (MCS).
14. The method of claim 9, wherein each TB of the plurality of TBs has a respective modulation and coding scheme (MCS) that is one of M-ary quadrature amplitude modulation (QAM) or quadrature phase shift keying (QPSK).
15. The method of claim 9, wherein the retransmitted one of the plurality of TBs has a modulation and coding scheme (MCS) that is different than an MCS of the one of the plurality of TBs that required retransmission.
16. The method of claim 9, wherein each TB of the plurality of TBs are received on different subcarriers.
CA2475859A 2002-02-13 2003-02-11 Transport block set transmission using hybrid automatic repeat request Expired - Lifetime CA2475859C (en)

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US35722402P 2002-02-13 2002-02-13
US60/357,224 2002-02-13
US10/279,393 2002-10-24
US10/279,393 US7287206B2 (en) 2002-02-13 2002-10-24 Transport block set transmission using hybrid automatic repeat request
PCT/US2003/004251 WO2003069824A2 (en) 2002-02-13 2003-02-11 Transport block set transmission using hybrid automatic repeat request

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