CN104243104A

CN104243104A - Method for determining user equipment downlink MCS

Info

Publication number: CN104243104A
Application number: CN201310228492.5A
Authority: CN
Inventors: 于小红
Original assignee: Potevio Institute of Technology Co Ltd
Current assignee: Potevio Institute of Technology Co Ltd
Priority date: 2013-06-08
Filing date: 2013-06-08
Publication date: 2014-12-24
Anticipated expiration: 2033-06-08
Also published as: CN104243104B

Abstract

The invention discloses a method for determining a user equipment downlink MCS. The method includes the steps that the initial MCS grades of all user equipment are set through a base station; the frequency deviation values of uplink data of the user equipment are measured through the base station, and users similar in absolute frequency value are classified into a big group; the user equipment in all the big groups is further classified into different small groups according to service types; for all the user equipment in the same small group, the ratio k of ACK feedbacks of all downlink services, which are received by F sub-frames, to all feedbacks is calculated; according to the relation between k and a preset threshold value, the MCS grades are adjusted. Compared with the prior art, signaling overheads can be reduced, and meanwhile the MCS grades of the user equipment can be adjusted in time.

Description

A kind of method determining user's equipment downward MCS

Technical field

The application relates to mobile communication technology field, particularly relates to the method that one determines subscriber equipment (UE) Corticofugal Modulation of Somatosensory and coding strategy (MCS, Modulation and Coding Scheme).

Background technology

In a communications system, the high-speed motion of subscriber equipment can cause the Rapid Variable Design of channel, and channel quality instruction (CQI) information of user equipment to report reduces accuracy because there being time delay.Such as in high-speed railways, subscriber equipment is generally with the speeds more than 300km/h.In this communication system of high ferro, not only there is the problem reducing CQI accuracy because of time delay, also there is the problem that ascending control information cannot correctly receive because of larger Doppler frequency shift.Contain the MCS information of user in the CQI value of user equipment to report, different channel qualities determines different MCS.

How effectively calculating CQI value for this special circumstances of high ferro thus determine the descending MCS of user, is the problem that the application will solve.

Summary of the invention

This application provides a kind of method determining user's equipment downward MCS, can signaling consumption be alleviated, the MCS grade of subscriber equipment can be adjusted simultaneously in time.

A kind of method determining user's equipment downward modulation and coding strategy MCS that the embodiment of the present application provides, comprising:

A, base station arrange the initial MCS grade of each subscriber equipment;

The frequency deviation value of B, base station measurement subscriber equipment upstream data, the user that frequency deviation value order of magnitude is close is divided into a large group;

C, to the subscriber equipment in each large group, be divided into different groups further according to type of service;

D, for all subscriber equipmenies in same group, the asserts feedback ACK calculating all downlink business received in F subframe accounts for the ratio k of all feedbacks; F is the cycle that the MCS preset upgrades, and represents with number of sub frames;

If E k is less than the first threshold value K0 pre-set, then in a follow-up F subframe, the MCS grade of the total user equipment of this group is reduced one-level; If k is greater than the second threshold value K1 pre-set, then in a follow-up F subframe, the MCS grade of the total user equipment of this group is improved one-level; If k is greater than the first threshold value K0 and be less than the second threshold value K1, the MCS of the subscriber equipment of this group is constant, wherein K0<K1.

Preferably, steps A comprises: system determines according to type of service the MCS grade that each type of service is corresponding, and base station is according to the initial MCS grade of the type of service determination subscriber equipment of the current use of subscriber equipment.

Preferably, network side adopts distributed structure, when subscriber equipment sends upstream data, selects a nearest radio frequency remote unit RRU as standard RRU; When described in step B, divide into groups to subscriber equipment in base station, only the subscriber equipment identical to standard RRU divides into groups..

As can be seen from the above technical solutions, by user according to frequency deviation value and type of service grouping, the ratio accounting for all feedbacks according to the ACK of subscriber equipment in each grouping adjusts MCS grade.Due in high ferro communication system, its channel situation of subscriber equipment in same compartment is substantially identical, in the process of moving, channel circumstance keeps constant substantially, this method need not adjust MCS respectively for each user, and substantially by the subscriber equipment in same compartment integrally, carries out MCS level adjustment simultaneously, thus reduce signaling consumption, the MCS grade of subscriber equipment can be adjusted in time simultaneously.

Accompanying drawing explanation

A kind of method flow schematic diagram determining user's equipment downward MCS that Fig. 1 provides for the embodiment of the present application.

Embodiment

High ferro communication system has itself feature, and its channel situation of the subscriber equipment in same compartment is substantially identical, and in the process of moving, channel circumstance occasional changes, such as access tunnel, but in the most of the time, channel circumstance keeps constant.Utilize These characteristics, the application gives effective CQI computational methods, alleviates signaling consumption, can adjust the MCS grade of subscriber equipment in time simultaneously.In LTE system, divided 32 kinds of fixing MCS grades according to channel situation, channel is better, and the MCS grade of employing is higher, and the transmission rate of data is higher, otherwise lower.

For making the know-why of technical scheme, feature and technique effect clearly, below in conjunction with specific embodiment, technical scheme is described in detail.

A kind of method flow determining user's equipment downward MCS that the embodiment of the present application provides as shown in Figure 1, comprises the steps:

Step 101: base station arranges the initial MCS grade of each subscriber equipment.

Described initial MCS value obtains set-up mode can be had multiple, such as, initial MCS value can be set according to the CAMEL-Subscription-Information of subscriber equipment, or, system according to type of service (as FTP, Vedio, VoIP etc.) determine the MCS grade that each type of service is corresponding, base station is according to the initial MCS grade of the type of service determination subscriber equipment of the current use of subscriber equipment.

Step 102: the frequency deviation value of base station measurement subscriber equipment upstream data, the subscriber equipment that frequency deviation value order of magnitude is close is divided into a large group, and each large group is designated as group Pn, n=1,2 respectively ..., N, N are group number.In same large group, the difference of subscriber equipment frequency deviation absolute value to each other will much smaller than the difference of the frequency deviation absolute value with other subscriber equipmenies of large group.

Step 103: to the subscriber equipment in each Pn group, be divided into different groups further according to type of service, be designated as Qm, m=1,2 ..., M, M are the type of service group number in Pn group.

Step 104: to all subscriber equipmenies in the group Qm in large group of each Pn, the asserts feedback ACK calculating all downlink business received in F subframe accounts for the ratio k of all feedbacks.F is the cycle that the MCS preset upgrades, and represents with number of sub frames.

Step 105: if k is less than the first threshold value K0 pre-set, i.e. k<K0, then reduce one-level by the MCS grade of the total user equipment of this group in a follow-up F subframe; If k is greater than the second threshold value K1 pre-set, i.e. k>K1, then in a follow-up F subframe, the MCS grade of the total user equipment of this group is improved one-level; If k is greater than the first threshold value and be less than the second threshold value, the MCS of the subscriber equipment of this group is constant.First threshold value K0 and the second threshold value K1 according to the actual requirements or the result of emulation experiment determine, and K0<K1.

If network side adopts distributed structure, when subscriber equipment sends upstream data, a nearest Remote Radio Unit (RRU) can be selected as standard RRU, and when described in step 102, divide into groups to subscriber equipment in base station, only the subscriber equipment identical to standard RRU divides into groups.

The foregoing is only the preferred embodiment of the application; not in order to limit the protection range of the application; within all spirit in technical scheme and principle, any amendment made, equivalent replacements, improvement etc., all should be included within scope that the application protects.

Claims

1. determine user's equipment downward modulation and a method of coding strategy MCS, it is characterized in that, comprising:

A, base station arrange the initial MCS grade of each subscriber equipment;

2. method according to claim 1, is characterized in that, steps A comprises: system determines according to type of service the MCS grade that each type of service is corresponding, and base station is according to the initial MCS grade of the type of service determination subscriber equipment of the current use of subscriber equipment.

3. method according to claim 1, is characterized in that, network side adopts distributed structure, when subscriber equipment sends upstream data, selects a nearest radio frequency remote unit RRU as standard RRU; When described in step B, divide into groups to subscriber equipment in base station, only the subscriber equipment identical to standard RRU divides into groups.