Physical downlink shared channel (PDSCH) scheduling method and device

A technology of physical downlink sharing and scheduling method, which is applied in the direction of adjusting transmission mode, adjusting channel coding, wireless communication, etc. It can solve problems such as high channel coding rate, affecting user performance, cell capacity, and failure to receive data, so as to improve transmission performance Effect

Inactive Publication Date: 2012-10-24
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using this method to schedule PDSCH, in some cases, the effective downlink channel coding rate will be too high, resulting in failure of downlink reception
For example, when the Control Format Indication (CFI for short) is 2 or 3, and the Modulation and Coding Scheme (MCS for short) is 28, the transport block (Resource Block, The downlink effective channel coding rate corresponding to RB for short is too high
In addition, in certain cases, if the RB resource all

Method used

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  • Physical downlink shared channel (PDSCH) scheduling method and device
  • Physical downlink shared channel (PDSCH) scheduling method and device
  • Physical downlink shared channel (PDSCH) scheduling method and device

Examples

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Embodiment 1

[0046] This embodiment takes figure 2 The time-frequency resource of the single antenna port shown is taken as an example for illustration, image 3 It is a flowchart of scheduling in this embodiment when the UE accesses a single-antenna cell (that is, the downlink transmission mode is TM1), as shown in image 3 As shown, it mainly includes the following steps:

[0047] Step S301, the UE accesses a single-antenna cell, and the downlink transmission mode is TM1;

[0048] Step S302, the eNB obtains the radio link quality information of the user equipment, and obtains the pre-scheduled MCS according to the BLER of the PDSCH channel;

[0049] Step S303, according to factors such as BSR and QoS, determine the TB block size TB that needs to be scheduled Size ;

[0050] Step S304, the RB resources allocated for the downlink do not coincide with the PBCH and the primary and secondary synchronization signals;

[0051] Step S305, according to figure 2 , calculate the number of R...

Embodiment 2

[0057] This embodiment takes Figure 4 The time-frequency resources of the two antenna ports shown are taken as an example for illustration, Figure 5 It is a flowchart of scheduling when the UE accesses a two-antenna cell (that is, the downlink transmission mode is TM3) in this embodiment, as shown in Figure 5 As shown, it mainly includes the following steps:

[0058] Step S501, the UE accesses a cell with one or two antennas, and the downlink transmission mode is TM3;

[0059]Step S502, the eNodeB obtains the radio link quality information of the user equipment, and obtains the MCS for dual-stream pre-scheduling according to the BLER of the PDSCH channel;

[0060] Step S503, according to factors such as BSR and QoS, determine the TB block size TB that needs to be scheduled Size ;

[0061] Step S504, the RB resource part of the downlink allocation overlaps with the PBCH;

[0062] Step S505, according to Figure 4 , calculate the number of REs that can actually be used ...

Embodiment 3

[0068] This embodiment takes Image 6 The time-frequency resources of the shown four antenna ports are taken as an example for illustration, Figure 7 It is a flow chart of scheduling when the UE accesses a four-antenna cell (that is, the downlink transmission mode is TM4) in this embodiment, as shown in Figure 7 As shown, it mainly includes the following steps:

[0069] Step S701, the UE accesses a four-antenna cell, and the downlink transmission mode is TM4;

[0070] Step S702, the eNB obtains the radio link quality information of the user equipment, and obtains the pre-scheduled MCS of each stream according to the BLER of the dual streams of the PDSCH channel;

[0071] Step S703, according to factors such as BSR, QoS, determine the TB block size TB that needs to be scheduled Size ;

[0072] Step S704, all the RB resources allocated for the downlink overlap with the PBCH;

[0073] Step S705, according to Image 6 , calculate the number of REs that can actually be used...

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Abstract

The invention provides a physical downlink shared channel (PDSCH) scheduling method and a PDSCH scheduling device. The method comprises the following steps of: acquiring and scheduling a preset modulation and coding scheme (MCS) and size TBsize of a transport block (TB) required to be distributed for user equipment; acquiring the maximum bit number which can be provided by resource block (RB) resources distributed by downlink of the system according to the MCS and the distribution condition of the RB resources distributed by downlink; judging whether the TBsize is greater than the maximum bit number, if not, scheduling by using the MCS, otherwise adjusting the RB, so that the adjusted TBsize is not greater than the adjusted maximum bit number which can be provided by the RB resources distributed by downlink, and scheduling by using the MCS and the adjusted RB; or adjusting the MCS, so that the adjusted TBsize is not greater than the maximum bit number which can be provided by the RB resources distributed by downlink; and scheduling by using the adjusted MCS. According to the method, the code rate of the PDSCH is adjusted, and an effective code rate of the PDSCH is reasonably selected so as to bear the downlink user data, so that the overall performance of a long term evolution (LTE) system is improved.

Description

technical field [0001] The present invention relates to the communication field, in particular, to a scheduling method and device for a physical downlink shared channel. Background technique [0002] The protocol requirements of the current Long-Term Evolution (LTE for short) Release 8: it can provide a downlink peak rate of 100 Mbps under 20 MHz spectrum bandwidth, can improve the performance of cell edge users, and can increase cell capacity, etc. The LTE system adopts the shared channel method to carry the user's uplink and downlink data transmission in both the uplink and downlink. This bearer method can make full use of effective spectrum resources, and is generally controlled and coordinated by the evolved Node B (eNB for short). Channel resources used to carry user data in the shared channel are scheduled. [0003] The Medium Access Control (MAC) scheduler on the eNB side determines the physical downlink channel (PDSCH) resource allocation that the system can finally...

Claims

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Application Information

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IPC IPC(8): H04W72/14
CPCH04L1/0009H04L1/0003H04W28/18H04W72/14H04W72/1289H04W28/06H04L1/0007H04L1/0015H04L1/0001H04W72/23
Inventor 陈继勋
Owner ZTE CORP
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