WO2012142811A1 - Procédé et dispositif de planification de canal partagé physique en liaison descendante - Google Patents

Procédé et dispositif de planification de canal partagé physique en liaison descendante Download PDF

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Publication number
WO2012142811A1
WO2012142811A1 PCT/CN2011/079387 CN2011079387W WO2012142811A1 WO 2012142811 A1 WO2012142811 A1 WO 2012142811A1 CN 2011079387 W CN2011079387 W CN 2011079387W WO 2012142811 A1 WO2012142811 A1 WO 2012142811A1
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Prior art keywords
mcs
allocated
downlink
resource
bits
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PCT/CN2011/079387
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English (en)
Chinese (zh)
Inventor
陈继勋
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中兴通讯股份有限公司
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Publication of WO2012142811A1 publication Critical patent/WO2012142811A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0015—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/18—Negotiating wireless communication parameters

Definitions

  • the present invention relates to the field of communications, and in particular to a method and an apparatus for scheduling a physical downlink shared channel.
  • the 20MHz spectrum bandwidth can provide a peak rate of 100Mbps downlink, improve the performance of cell edge users, and improve cell capacity.
  • the LTE system uses the shared channel method to carry the uplink and downlink data transmission of the user in the uplink and the downlink.
  • the bearer mode can fully utilize the effective spectrum resources, and is generally controlled by the evolved base station (evolved Node B, e B for short). And scheduling channel resources for carrying user data in the shared channel.
  • the Medium Access Control (MAC) scheduler on the eNB side determines the downlink physical channel that the system can finally provide for the user in the resource allocation of the Physical Downlink Shared Channel (PDSCH).
  • MAC Medium Access Control
  • the data carrying capacity, and the number of user information bits mapped in the downlink physical channel bearers are determined by factors such as the coding rate, modulation mode, and whether data retransmission are adopted by the MAC scheduler.
  • the user equipment User Equipment, UE for short
  • the transport block TB
  • the downlink effective channel coding rate is defined as: the number of downlink information bits (including CRC bits) divided by the number of physical channel bits on the PDSCH.
  • the scheduling of the PDSCH in this manner may cause the downlink effective channel coding rate to be too high in some cases, thereby causing downlink reception failure.
  • the MAC Block allocates a Transport Block (Resource Block, The downlink effective channel coding rate corresponding to RB) is too high.
  • the RB resource allocated by the MAC scheduler overlaps with the Physical Broadcast Channel (PBCH) resource, the downlink effective channel coding rate is also too high.
  • PBCH Physical Broadcast Channel
  • a primary object of the present invention is to provide a method and apparatus for scheduling a physical downlink shared channel to solve at least the above problems.
  • a scheduling method for a physical downlink shared channel including: acquiring a modulation and coding scheme (MCS) used for scheduling, and a size TB Slze of a transport block (RB) to be allocated for a user equipment, and The resource block (RB) corresponding to the TB; the maximum number of bits that the RB resource that the system downlink allocates can be obtained according to the allocation of the RB resources allocated by the downlink; and whether the TB Slze is greater than the maximum number of bits, if not, The scheduling is performed by using the MCS.
  • MCS modulation and coding scheme
  • the RB is adjusted so that the TB Slze corresponding to the adjusted RB is not greater than the maximum number of bits that can be provided by the RB resource allocated by the system downlink, and the MCS and the adjusted RB are used for scheduling.
  • the MCS is adjusted so that the size of the TB allocated to the user equipment according to the adjusted MCS is not greater than the maximum number of bits that can be provided by the RB resource allocated by the system downlink, and is performed by using the adjusted MCS and the RB. Scheduling.
  • the maximum number of bits that can be provided by the RB resource allocated by the downlink of the system is obtained according to the allocation of the RB resources allocated by the downlink and the downlink, and the method includes: calculating a number of resource particles RE that can be used for service transmission in the RB allocated by the UE; In the corresponding relationship between the MCS and the target code rate, the target code rate corresponding to the pre-used MCS is obtained, and the RB allocated by the system downlink is obtained according to the target code rate and the number of REs that can be used for service transmission.
  • the maximum number of bits a resource can provide.
  • the number of resource particle REs that can be used for the service transmission in the RB allocated by the UE is calculated, including: determining whether the RB allocated by the UE is coincident with the physical broadcast channel PBCH or the primary and secondary synchronization signals, and if not, calculating the allocation to the UE.
  • the number of resource REs that can be used for service transmission in the RB; otherwise, the number of first REs that can be used for service transmission in the RBs that overlap with the PBCH or the primary and secondary synchronization signals in the RB allocated for the UE, and the allocation to the UE are calculated.
  • the number of second REs that can be used for service transmission in the remaining RBs other than the RBs that overlap with the PBCH or the primary and secondary synchronization signals, and the sum of the first RE number and the second RE number is used as the RB allocated for the UE.
  • the method before acquiring the modulation coding mode MCS that is used for scheduling and the size TB Slze of the transport block TB that needs to be allocated for the user equipment, and the resource block RB corresponding to the TB, the method further includes: traversing a preset TB size table to calculate Different control formats indicate the target bit rate corresponding to the MCS under the CFI, and the corresponding relationship is obtained.
  • the modulation coding mode MCS that is scheduled to be used in advance and the transport block that needs to be allocated for the user equipment are acquired.
  • the size TB Slze of the TB and the resource block RB corresponding to the TB include: determining, according to the channel quality indication CQI reported by the UE, the MCS of the scheduling and the I TBS corresponding to the MCS according to the block error rate BLER of the PDSCH ; Buffer Status Report BSR and Quality of Service QoS determine the TB that needs to be allocated for the UE.
  • the size TB Slze determines the number of RBs allocated to the UE and the location of the RB according to the I TBS corresponding to the pre-used MCS, the TB Slze, and the downlink bandwidth available to the system.
  • the RB is adjusted so that the TB Slze corresponding to the adjusted RB is not greater than the maximum number of bits that the RB resource allocated by the system downlink can provide, and the MCS and the adjusted RB are used for scheduling; or, the MCS is adjusted according to the adjusted
  • the size of the transport block TB that the MCS needs to allocate for the user equipment is not greater than the maximum number of bits that can be provided by the downlink allocated RB resource.
  • the scheduling using the adjusted MCS and the foregoing RB includes: searching for a preset TB size table and MCS Whether there is a record of the TB size that is not greater than the maximum number of bits that the RB resource allocated by the downlink allocation of the system is available in the corresponding record, and if yes, the RB is adjusted to the RB corresponding to the found record, and the MCS and the adjustment are used.
  • the RB is scheduled to be scheduled; otherwise, the TB size table is searched for a record whose TB size is not less than TB Slze and is not greater than the maximum number of RB resources allocated by the system downlink, and the MCS is adjusted to correspond to the MCS of the found record.
  • the adjusted MCS and the above RBs are used for scheduling.
  • a scheduling apparatus for a physical downlink shared channel including: a first acquiring module, configured to acquire a modulation and coding mode MCS scheduled for use in advance, and a TB to be allocated for a user equipment.
  • a first acquiring module configured to acquire a modulation and coding mode MCS scheduled for use in advance, and a TB to be allocated for a user equipment.
  • a second acquiring module configured to obtain a maximum number of bits that can be provided by the RB resource allocated by the system downlink according to the allocation of the RB resources allocated by the MCS and the downlink; the determining module is set to determine Whether the TB Slze is not greater than the maximum number of bits, if yes, the scheduling scheduling module uses the MCS for scheduling, otherwise, the adjustment module is triggered; the adjustment module is set to adjust the allocated RB, so that the TB Slze corresponding to the adjusted RB is not greater than the The maximum number of bits that can be provided by the RB resource allocated by the downlink of the system, the triggering scheduling module uses the MCS and the adjusted RB to perform scheduling; or, the MCS is adjusted, so that the transport block TB allocated to the user equipment according to the adjusted MCS needs
  • the size is not greater than the maximum number of bits that the RB resource allocated by the system downlink can provide, triggering the scheduling module.
  • the adjusted MCS and the foregoing RB are used for scheduling; and the scheduling module is configured to schedule the PDSCH.
  • the second obtaining module includes: a calculating unit, configured to calculate a number of resource particles RE that can be used for service transmission in the RB allocated to the UE; and an acquiring unit, configured to indicate the MCS and the target code from different preset control formats In the correspondence between the rates, the target bit rate corresponding to the pre-used MCS is obtained, and the maximum number of bits that the RB resource allocated by the system downlink can be obtained is obtained according to the target code rate and the number of REs that can be used for service transmission.
  • the calculation unit is configured to calculate that the RBs that are allocated to the UE and overlap with the PBCH or the primary and secondary synchronization signals can be used in the RBs.
  • the sum of the two RE numbers is the number of resource particles RE that can be used for service transmission in the RBs allocated for the UE.
  • the adjusting module includes: a first searching unit, configured to search for a record of a TB size that is not greater than a maximum number of bits that the RB resource allocated by the system downlink allocation in the record corresponding to the MCS in the preset TB size table, If yes, the trigger adjustment unit adjusts the allocated RB to the RB corresponding to the found record, and does not trigger the second search unit; the second search unit is configured to search for the RB corresponding to the RB in the preset TB size table.
  • the trigger adjustment unit adjusts the MCS to correspond to the MCS of the found record; the adjustment unit is set to adjust the MCS or the UE The assigned RB.
  • the MCS or the allocated RB resources are adjusted, thereby solving the problem that the PDSCH channel carries the downlink user data because it is effective.
  • the system resources caused by the inappropriate coding rate are seriously wasted, and the effect of improving the transmission performance of the LTE system is achieved.
  • FIG. 1 is a flowchart of a method for scheduling a physical downlink shared channel according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of time-frequency resources of a single antenna port according to an embodiment of the present invention
  • FIG. 4 is a schematic diagram of time-frequency resources of two antenna ports according to Embodiment 1 of the present invention
  • FIG. 1 is a flowchart of a method for scheduling a physical downlink shared channel according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of time-frequency resources of a single antenna port according to an embodiment of the present invention
  • FIG. 4 is a schematic diagram of time-frequency resources of two antenna ports according to Embodiment 1 of the present invention
  • FIG. 5 is a flowchart according to Embodiment 2 of the present invention
  • FIG. 6 is a four-antenna according to Embodiment 2 of the present invention
  • FIG. 7 is a detailed flowchart of a third embodiment of the present invention
  • FIG. 8 is a schematic structural diagram of a scheduling apparatus for a physical downlink shared channel according to an embodiment of the present invention.
  • BEST MODE FOR CARRYING OUT THE INVENTION BEST MODE FOR CARRYING OUT THE INVENTION
  • FIG. 1 is a flowchart of a method for scheduling a physical downlink shared channel according to an embodiment of the present invention. As shown in FIG.
  • the method mainly includes the following steps (steps S102-S108): Step S102: Acquire a modulation and coding mode pre-used by the scheduling (MCS) and the size of the transport block (TB) to be allocated to the user equipment TB Slze and the resource block RB corresponding to the TB; in the embodiment of the present invention, the pre-used MSC can be obtained by using related technologies and needs to be
  • the size of the RB allocated by the UE may be determined according to the channel quality indicator (CQI) reported by the UE and the block error rate (BLER) of the PDSCH, and the MCS scheduled for use and in the preset TB size table.
  • CQI channel quality indicator
  • BLER block error rate
  • the I TBS corresponding to the MCS and then determining the size TB Slze of the TB to be allocated for the UE according to the Buffer Status Report (BSR) and the Quality of Service (QoS) of the downlink transmission data requirement, and then according to the I corresponding to the MCS above.
  • the TBS , the TB Slze obtained in the above step S102, and the downlink bandwidth available to the system are determined as the number of RBs allocated by the UE and the location of the RB.
  • step S104 according to the allocation of the RB resources allocated by the MCS and the downlink, the maximum number of bits that can be provided by the RB allocated by the system is obtained.
  • the RB allocated to the UE may be calculated.
  • the number of REs that can be used for service transmission, and the target code rate corresponding to the pre-used MCS is obtained from the correspondence between the MCS and the target code rate under different preset CQIs, according to the target code rate and can be used for service transmission.
  • the number of REs is the maximum number of bits that can be provided by the RB resources allocated by the downlink of the system. For example, it can be traversed in the TB Size table (see 213 protocol table) provided in the LTE system Release 8 protocol, and the target code rate (R MCS ) corresponding to the MCS under different control format indication (CFI) is calculated.
  • the MCS calculates the maximum number of bits that can be provided by the RB resources allocated by the downlink of the system according to the R MCS and the number of REs that can be used for service transmission. For example, first look up the corresponding MCS and the current modulation mode from Table 1, and then calculate the maximum number of bits N MA XSi Ze that the RB resource allocated by the system downlink can provide according to the following formula:
  • N ⁇ number of REs used for service transmission XRmcsX Qm Table 1
  • the UE is allocated for allocation to the UE, in order to avoid the problem that the RB resources allocated to the UE overlap with the PBCH or the primary and secondary synchronization signals, and the downlink effective channel coding rate is too high.
  • the number of resource particles (REs) that can be used for service transmission in the RB is determined, it is first determined whether the RB allocated by the UE overlaps with the physical broadcast channel (PBCH) or the primary and secondary synchronization signals. If yes, the RB allocated for the UE is first calculated.
  • PBCH physical broadcast channel
  • the second RE number (N RE1 ) that can be used for service transmission in the remaining RBs, and the sum of the first RE number (N RE o) and the second RE number (N RE1 ) can be used as a service in the RB allocated for the UE.
  • the span of the number of RBs occupied by the PBCH or the primary and secondary synchronization is seven, that is, only half of the first RB and the seventh RB overlap with the PDSCH.
  • the PBCH appears in the second time slot of the subframe 0
  • the primary and secondary synchronization signals appear in the first time slot of the subframe 0 and the subframe 5.
  • Step S106 determining whether the TB Slze is greater than the maximum number of bits, if not, executing step S108, or not, performing step SI10; step S108, using the MCS and RB to perform scheduling; if TB ⁇ N ⁇ , adopting If the LS Slze obtained by the step S102 is the TB Slze obtained by the UE in step S102, the actual coding rate is greater than the reference coding rate, and the downlink transmission fails. Therefore, adjustment is needed. If TB Slze ⁇ , the calculation may be performed in step S102. The MCS schedules the TB Slze obtained in step S102 for the UE, and can ensure that the actual coding rate is not greater than the reference coding rate.
  • step S110 the allocated RBs are adjusted so that the TB Slze corresponding to the adjusted RBs is not greater than the maximum number of bits that can be provided by the RB resources allocated by the system downlink, and the MCS and the adjusted RBs are used for scheduling, where the size of the scheduled TBs For the adjusted TB Slze; or, adjust the MCS so that the size of the TB allocated to the user equipment according to the adjusted MCS needs is not greater than the maximum number of bits that the RB resource allocated by the system downlink can provide, and the adjusted MCS is used. Dispatched with RB.
  • the record corresponding to the MCS in the preset TB Size table may be found to have a record of a TB size that is not greater than the maximum number of bits that the downlink allocated RB resource can provide. If yes, the allocated RB is adjusted to be found. The RB corresponding to the record is scheduled using the MCS and the adjusted RB. Otherwise, in the preset TB size table, it is possible to find, in the record corresponding to the allocated RB, whether there is a record that is not greater than the maximum number of bits, and adjust the MCS to correspond to the MCS of the found record, and use the adjusted MCS. And the RB is scheduled.
  • Embodiment 1 This embodiment uses the time-frequency resource of the single-antenna port shown in FIG. 2 as an example.
  • FIG. 3 is a case where the UE accesses a single-antenna cell (that is, the downlink transmission mode is TM1). The flowchart of the scheduling, as shown in FIG.
  • Step S301 The UE accesses a single antenna cell, and the downlink transmission mode is TM1.
  • step S302 the e B obtains the radio link quality of the user equipment.
  • Information, according to the BLER of the PDSCH channel, the pre-scheduled MCS is obtained;
  • Step S303 determining the TB block size TB Slze to be scheduled according to factors such as BSR and QoS;
  • Step S304 the downlink allocated RB resource is not associated with the PBCH, the primary and secondary synchronization signals
  • step S305 according to FIG.
  • Step S306 determining whether 18 ⁇ is greater than N ⁇ , if greater than , the need to adjust the encoding rate (i.e., step S307), otherwise, step S302 is obtained using MCS TB Slze size scheduling the RB, and may not ensure that the actual coding rate is greater than the reference coding rate; step S307, Off whether sufficient resources RB, and if so, performing step S308, otherwise, to step S309; step S308, the above-mentioned MCS remains unchanged, the actual resource allocation adjustment RB, RB allocation of resources increases, so that the scheduling of TB Slze - A TB Slze — A ⁇ N MAXSlze — A (ie, the maximum number of bits that the current system downlink allocated RB resources can provide), so that the actual coding rate is not greater than the reference coding rate; Step S309,
  • the MCS reduces the MCS such that the scheduled TB SlzeF A satisfies TB SlzeF A ⁇ N MAXSj7e such that the actual coding rate is not greater than the reference coding rate.
  • Embodiment 2 This embodiment uses the time-frequency resources of the two antenna ports shown in FIG. 4 as an example.
  • FIG. 5 is a case where the UE accesses a two-antenna cell (ie, the downlink transmission mode is TM3) in this embodiment.
  • the flowchart of the scheduling, as shown in FIG. 5, mainly includes the following steps: Step S501: The UE accesses a two-antenna cell, and the downlink transmission mode is TM3.
  • step S502 the eNodeB acquires radio link quality information of the user equipment. According to the BLER of the PDSCH channel, the dual-stream pre-scheduled MCS is obtained.
  • Step S503 the TB block size TB Slze to be scheduled is determined according to the BSR, QoS, and the like;
  • Step S504 the downlink allocated RB resource part is coincident with the PBCH;
  • Step S505 According to FIG. 4, the number of REs actually available for service transmission in the downlink allocated RB resources is calculated, thereby obtaining the maximum number of bits N MAXS1ze that can be provided ; step S506, determining whether the TB Slze is greater than N MAXSlze , if it is greater than, it needs to be adjusted.
  • step S502 is obtained using MCS scheduling RB TB Slze size, and may not ensure that the actual coding rate is a coding rate is greater than the reference;
  • step S507 it is determined whether there is sufficient RB resources, if yes, step S508 is performed, otherwise, step S509 is performed; in step S508, if the MCS remains unchanged, the actually allocated RB resources are adjusted, and the allocated RB resources are increased, so that The scheduled TB SlzeF - A satisfies TB SlzeF - A ⁇ N MAXSlze - A, so that the actual coding rate is not greater than the reference coding rate; Step S508, the allocated RB resources are maintained, the actual scheduled MCS is adjusted, the MCS is reduced, and the scheduled TB is SlzeF — A satisfies TB SlzeF — A ⁇ N MAXSlze , so that the actual coding rate is not greater than
  • Embodiment 3 uses the time-frequency resource of the four-antenna port shown in FIG. 6 as an example.
  • FIG. 7 is a cell in which the UE accesses a four-antenna in the embodiment (ie, the downlink transmission mode is TM4).
  • the flow chart of scheduling as shown in FIG. 7, mainly includes the following steps: Step S701, the UE accesses a four-antenna cell, and the downlink transmission mode is TM4;
  • the eNB acquires the radio link quality information of the user equipment, and obtains the MCS of each stream pre-scheduled according to the BLER of the dual stream of the PDSCH channel.
  • Step S703 determining the TB block size TB to be scheduled according to factors such as BSR and QoS. Slze; step S704, all assigned downlink resource RB coincides with the PBCH; step S705, the FIG. 6, the calculated downlink RB allocated resources actually available for service transmission number RE, to arrive at the maximum bit number that can be provided ⁇ 1 Step S706, for each stream, it is determined whether the TB Slze is greater than N MAXS1ze , if it is greater, then the coding rate needs to be adjusted (ie, step S707 is performed), and the MCS obtained in step S702 is used to schedule the RB of the TB Slze size, and It can be ensured that the actual coding rate is not greater than the reference coding rate; Step S707, determining whether there is sufficient RB resources, if yes, executing step S308, otherwise, performing step S309; step S708, the MCS actually scheduled by each flow remains unchanged the case, adjust the actual resource allocation RB, the RB allocation
  • FIG. 8 is a schematic structural diagram of a scheduling apparatus of a physical downlink shared channel according to an embodiment of the present invention.
  • the scheduling apparatus of the physical downlink shared channel mainly includes: a first acquiring module 10, a second acquiring module 20, and determining Module 30, adjustment module 40, and scheduling module 50.
  • the first obtaining module 10 is configured to obtain a modulation and coding mode (MCS) for scheduling pre-use, a size TB Slze of a transport block (TB) to be allocated for the user equipment, and an RB corresponding to the TB; and a second acquiring module 20, connecting The first obtaining module 10 is configured to obtain a maximum number of bits that can be provided by the RB resource allocated by the downlink of the system according to the allocation of the RB resources allocated by the downlink and the downlink; the determining module 30 is connected to the first acquiring module 10 and the second acquiring The module 20 is configured to determine whether the TB Slze is greater than the maximum number of bits. If yes, the trigger scheduling module 50 uses the MCS for scheduling.
  • MCS modulation and coding mode
  • the adjustment module 40 is triggered; the adjustment module 40 is connected to the determination module 30, and is configured to adjust the allocation.
  • RB, the TB Slze corresponding to the adjusted RB is not greater than the maximum number of bits that the RB resource allocated by the downlink of the system can provide, and the scheduling is triggered.
  • the module 50 uses the MCS and the adjusted RB to perform scheduling; or, the MCS is adjusted, so that the size of the transport block RB allocated to the user equipment according to the adjusted requirements of the MCS is not greater than that that can be provided by the RB resource allocated by the system downlink.
  • the first obtaining module 10 may determine, according to a channel quality indicator (CQI) reported by the UE and a block error rate (BLER) of the PDSCH, to schedule the pre-used MCS and to associate with the MCS in a preset TB size table.
  • CQI channel quality indicator
  • BLER block error rate
  • the TB Slze obtained in the above step S102 and the downlink bandwidth available to the system are determined as the number of RBs allocated by the UE and the location of the RB.
  • the second obtaining module 20 may include: a calculating unit, connected to the determining unit, configured to calculate a resource particle (RE) number that can be used for service transmission in the RB allocated to the UE;
  • the obtaining unit is connected to the calculating unit, and is configured to obtain a target bit rate corresponding to the pre-used MCS according to the correspondence between the MCS and the target bit rate indicated by the preset different control format, according to the target bit rate and can be used for the service
  • the calculation unit may be configured to calculate that the RBs that are allocated to the UE and the PBCH or the primary and secondary synchronization signals may be used in the RBs.
  • the first RE number of the service transmission, and the number of second REs that can be used for service transmission in the remaining RBs other than the RBs that are overlapped with the PBCH or the primary and secondary synchronization signals in the RB allocated to the UE, the first RE number and The sum of the second RE numbers is the number of resource particles RE that can be used for service transmission in the RBs allocated for the UE.
  • the adjustment module 50 may further include: a first searching unit, configured to: search for a RB resource that is not greater than the downlink allocation of the system in the record corresponding to the MCS in the preset TB Size table.
  • the maximum number of bits of the TB SlzeF_A record that can be provided if yes, the trigger adjustment unit adjusts the allocated RB to the RB corresponding to the found record, otherwise, triggers the second search unit; the second search unit is set to Determining, in the preset TB Size table, whether there is a record that is not greater than the maximum number of bits that the downlink allocated RB resource can provide, and the trigger adjustment unit adjusts the MCS to correspond to the found record MCS; Adjust the unit, set to adjust the MCS or RB.
  • the effective coding rate allocated to the UE may not be limited to exceed the upper limit of the coding rate specified by the protocol, and the RB resource and the PBCH allocated to the UE may be When the primary and secondary synchronization signals overlap, adjust their coding rate to satisfy AMC (Adaptive The MCS requirements of Modulation and Coding, which can improve the accuracy of downlink user data transmission and the overall performance of the LTE system.
  • AMC Adaptive The MCS requirements of Modulation and Coding, which can improve the accuracy of downlink user data transmission and the overall performance of the LTE system.
  • the computing device may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein.
  • the steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps are fabricated as a single integrated circuit module.
  • the invention is not limited to any specific combination of hardware and software.
  • the above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

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  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention porte sur un procédé et un dispositif permettant de planifier un canal partagé physique en liaison descendante. Le procédé comprend les étapes suivantes : acquérir un schéma de codage et de modulation (MCS) pré-utilisé pour planifier et la taille TBsize d'un bloc de transport (TB) devant être attribué à un équipement d'utilisateur ; en fonction du MCS et d'une situation d'attribution d'une ressource RB attribuée par la liaison descendante, acquérir le nombre maximal de bits que la ressource RB attribuée par la liaison descendante du système est capable de fournir, détermer si la taille TBsize est supérieure au nombre maximum de bits, et si ce n'est pas le cas, exécuter une planification au moyen du MCS ; dans le cas contraire, régler la ressource RB, de sorte que la taille TBsize après le réglage ne soit pas supérieure au nombre maximal de bits que la ressource RB attribuée par la liaison descendante est capable de fournir après le réglage, et exécuter une planification au moyen du MCS et de la RB réglée, ou régler le MCS de sorte que la taille TBsize après le réglage ne soit pas supérieure au nombre maximal de bits que la ressource RB attribuée par la liaison descendante est capable de fournir, et exécuter une planification en moyen du MCS réglé. Grâce à la présente invention, la vitesse de codage d'un canal PDSCH peut être réglée et une vitesse de codage efficace du canal PDSCH est raisonnablement sélectionnée pour transporter des données d'utilisateur en liaison descendante, ce qui permet d'améliorer les performances globales d'un système LTE.
PCT/CN2011/079387 2011-04-22 2011-09-06 Procédé et dispositif de planification de canal partagé physique en liaison descendante WO2012142811A1 (fr)

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