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Method and device for controlling physical downlink control channel (PDCCH) transmission

A physical downlink control and control channel technology, applied in wireless communication, electrical components, etc., can solve the problems affecting the throughput of the downlink system and the number of online users, the waste of PDCCH and PDSCH resources, and the inability to allocate resources at the same time, so as to improve throughput traffic and online users, reduce PDCCH collisions, and improve resource utilization

Active Publication Date: 2012-01-18
北京万海云科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, there are many problems in the existing PDCCH transmission method. For example, the existing technology only considers the corresponding PDCCH transmission according to the output result of the physical downlink shared channel (Physical Downlink Shared CHannel, PDSCH) scheduling decision. The identification (ID) and the subframe number used are randomly mapped using the Hash function to obtain the starting position of the PDCCH CCE
This randomized mapping method is likely to cause PDCCH congestion between different UEs, that is, the starting positions of PDCCH CCEs obtained by randomized mapping of different UE IDs and subframe numbers may be the same, and PDCCH CCE resources at the same position cannot be simultaneously Assigned to two UEs, resulting in collision of PDCCHs of different UEs, resulting in waste of PDCCH and PDSCH resources, affecting the throughput of the downlink system and the number of online users

Method used

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  • Method and device for controlling physical downlink control channel (PDCCH) transmission
  • Method and device for controlling physical downlink control channel (PDCCH) transmission
  • Method and device for controlling physical downlink control channel (PDCCH) transmission

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Experimental program
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Embodiment 1

[0027] This embodiment provides a method for controlling transmission of a physical downlink control channel, the method including:

[0028] 11: Execute TDPS / FDPS / SDPS scheduling.

[0029] In this step, resource scheduling is performed according to Time Domain Packet Scheduling (TDPS), Frequency Domain Packet Scheduling (FDPS) or Spacial Domain Packet Scheduling (SDPS). For example, the eNB selects UEs that can be scheduled according to available resources, and pre-allocates physical resource blocks (Physical Resource Blocks, PRBs) used by PDSCH for these UEs; and calculates the starting position of the PDCCH CCE of the UE that can be scheduled according to the Hash function, etc. .

[0030] 12: Obtain an initial value of a Control Format Indicator (CFI), and calculate an equivalent physical downlink control channel (PDCCH) data-to-pilot ratio of the current user equipment (UE) according to the initial value of the CFI.

[0031] The pilot ratio calculated in step 12 is an eq...

Embodiment 2

[0040] The method for controlling the transmission of the physical downlink control channel provided in this embodiment adopts a semi-static PDCCH total power setting, that is, a power pool is set for the PHICH, and its change and update are slow, so that the calculated PDCCH power also changes and updates slowly. It may be called "semi-static PDCCH total power setting".

[0041] This method mainly adopts a link-adaptive conflict resolution method, the main point of which is: when a CCE conflicts, traverse other possible CCE search spaces; if there is a non-conflicting CCE space available, resolve the conflict, otherwise, give up Resource scheduling for low-priority UEs among UEs corresponding to conflicting PDCCH CCEs. First, execute TDPS / FDPS / SDPS scheduling, see step 11 above for this step. Then, perform the acquisition operation of the CFI initial value, including at least the following four methods:

[0042] Method 1: Calculate the initial value of CFI based on the stat...

Embodiment 3

[0103] The solution of the third embodiment further optimizes and integrates the resources on the basis of the second embodiment, and improves the utilization rate of the resources. The main difference between Embodiment 3 and Embodiment 2 is that, see figure 2 , in step 5 of the second embodiment, if there is still no resource to allocate after traversing the CCE candidate set of UE k, then abandon the scheduling of UE k currently being processed, release the physical resource block PRB allocated for the current UE, and continue Treat it as follows:

[0104] 6. Process the schedulable UEs that have been pre-allocated PRB resources according to the above steps 2-5 until all UEs are processed;

[0105] 7. Determine whether there are released PRB resources and whether there are remaining PDCCH CCE resources available;

[0106] 8. If there are both PRB and remaining CCE resources, then go to step 9; if there is no one or both of PRB and remaining CCE resources, go to step 11; ...

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Abstract

The invention discloses a method and a device for controlling physical downlink control channel (PDCCH) transmission, which can accurately and effectively carry out the scheduling of PDCCH CCEs (control channel element), increase the PDCCH resource utilization rate and the PDSCH (physical downlink shared channel) transmission efficiency and optimize downlink scheduled transmission. The method for controlling physical downlink control channel transmission, which is provided by the embodiment of the invention, includes the following steps: acquiring the initial value of a CFI (Common Flash Interface), and according to the initial value of the CFI, calculating the equivalent PDCCH data-to-pilot frequency ratio of the current UE (User Equipment); according to the equivalent PDCCH data-to-pilot frequency ratio in combination with the channel quality information of the UE, calculating the number Lk of the PDCCH CCEs needed by the current UE; if the first PDCCH CCE candidate set for the current UE is already occupied, then traversing all the other PDCCH CCE candidate sets for the current UE, judging whether Lk idle CCE resources exist in the PDCCH CCE candidate sets, and if the Lk idle CCE resources exist in the PDCCH CCE candidate sets, allocating the PDCCH CCE resources to the current UE and sending the PDCCH of the current UE on the PDCCH CCEs, or else calling off resource scheduling for the corresponding UE in UEs conflicting with one another for the resources.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a method and equipment for controlling transmission of a physical downlink control channel. Background technique [0002] When Long Term Evolution (LTE) schedules transmission, it is necessary to indicate related resource allocation, modulation and coding scheme (MCS), etc. through a Physical Downlink Control Channel (Physical Downlink Control CHannel, PDCCH). [0003] In the current LTE PDCCH transmission process, the evolved base station (eNB) first schedules multiple UEs, and then calculates the initial Control Channel Element (CCE) ) position and the number of occupied PDCCH CCEs, and finally, the PDCCH of each UE is sent on the corresponding CCE. [0004] However, there are many problems in the existing PDCCH transmission method. For example, the existing technology only considers the corresponding PDCCH transmission according to the output result of ...

Claims

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Application Information

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IPC IPC(8): H04W72/12
Inventor 白杰张连波
Owner 北京万海云科技有限公司
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