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Resource scheduling method and device in long term evolution system

A long-term evolution system and resource scheduling technology, applied in the field of resource scheduling, can solve the problems of waste of PDCCH and PDSCH resources, CCE resources cannot be allocated at the same time, affecting downlink system throughput, etc., to reduce PDCCH collisions, improve throughput and online users. Quantity, the effect of improving resource utilization

Active Publication Date: 2014-03-19
北京万海云科技有限公司
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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 used subframe number use the Hash function to randomize the mapping to obtain the starting position of the CCE
This randomized mapping method is likely to cause PDCCH congestion between different UEs, that is, the starting positions of CCEs obtained by randomized mapping of different UEIDs and subframe numbers may be the same, and the CCE resources at the same position cannot be allocated to two UEs at the same time. UEs, resulting in PDCCH collisions of different UEs, resulting in a waste of PDCCH and PDSCH resources, affecting the throughput of the downlink system

Method used

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  • Resource scheduling method and device in long term evolution system
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  • Resource scheduling method and device in long term evolution system

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Embodiment 1

[0026] The main technical concept of this solution is: after the link adaptive adjustment, when there is still a conflict of CCE resources, first reduce the number of CCEs required by the current UE (or called this UE) and increase the power at the same time, and judge whether the resources are satisfied. allocation requirements; if not satisfied, reduce the number of CCEs required by other UEs, and then judge whether the resource allocation requirements of this UE can be met; ” to adjust the number of CCEs and power successively.

[0027] The main reason why this solution adopts the above-mentioned alternating power adjustment method instead of multiple CCE number and power adjustment methods of "only this UE" to optimize resource allocation is that if only the number of CCEs of this UE is adjusted, the power offset The compensation will be very large, the difference between the UE EPRE and the average EPRE is too large, the influence on the performance is unstable, and it is...

Embodiment 2

[0057] In the second embodiment, after using the power adaptive operation in the first embodiment to update the number of PDCCH CCEs required by the UE, the equivalent PDCCH data-to-pilot ratio of the corresponding UE is updated at the same time, so as to ensure that under the same OFDM symbol port p The sum of the power of each UE is not greater than the maximum power allowed by the system.

[0058] In Embodiment 2, firstly, TDPS / FDPS / SDPS scheduling is executed, and secondly, an operation of acquiring the initial value of CFI is executed. For the operation of these steps, refer to the above steps 11 and 12. Again, see figure 2 , proceed as follows:

[0059] 1. Calculate the equivalent PDCCH data-to-pilot ratio according to the initial value of CFI;

[0060] 2. According to the equivalent PDCCH data-to-pilot ratio, combined with the channel quality information of the UE, calculate the number L of PDCCH control channel elements CCE required by the current UE k .

[0061] ...

Embodiment 3

[0118] In Embodiment 2, power adjustment is only performed on UEs involved in CCE conflicts. At this time, there is a certain degree of power waste for UEs that do not need to perform CCE conflict adjustments.

[0119] In order to further optimize the power of this part and improve resource utilization, in the solution of this embodiment, power adjustment is performed on all schedulable UEs so that the power of the UEs only meets the demodulation threshold.

[0120] The main difference between the processing method of the third embodiment and the second embodiment is:

[0121] In the above step 2, the number of CCEs L of UE k is calculated k Finally, adjust the power at the same time, so that the power can just meet the target demand without causing waste. The adjustment amount is:

[0122] Δ sin r k = SINR t arg ...

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Abstract

The invention discloses a resource scheduling method and device in a long term evolution system, which can improve the transmission efficiency of a PDSCH (physical downlink shared channel), optimize downlink scheduling transmission and promote the throughput of the downlink system and the number of online users. The resource scheduling method in the long term evolution system provided by the embodiment of the invention comprises the following steps: calculating an equivalent PDCCH (physical downlink control channel) data pilot frequency ratio of the current UE (user equipment) according to a CFI (common flash interface) initial value; calculating the CCE (control channel element) number Lk of the PDCCH required by the current UE according to the equivalent PDCCH data pilot frequency ratio and the channel quality information of the UE; if all the PDCCH CCE candidate sets of the current UE do not have available PDCCH CCE resources for distribution of the current UE after traversal, carrying out the following power adaptation operation: updating the Lk of the current UE to Lk', traversing all the PDCCH CCE candidate sets of the current UE, and selecting UEj from other schedulable UEs if no allocable PDCCH CCE resources exist; updating the PDCCH CCE number Lj required by the UEj to Lj', releasing the resources occupied in the current PDCCH CCE candidate set, and updating the PDCCH CCE candidate set of the current UE.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a resource scheduling method and equipment in a long term evolution system. 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) ) positions and the number of occupied CCEs, and finally, the PDCCH of each UE is sent on the corresponding CCEs. [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 downlin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W28/02H04W72/12
Inventor 白杰张连波
Owner 北京万海云科技有限公司
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