CN102170704A

CN102170704A - Uplink multi-cell base station cooperative user scheduling method

Info

Publication number: CN102170704A
Application number: CN2011101363333A
Authority: CN
Inventors: 黎海涛
Original assignee: Beijing University of Technology
Current assignee: Beijing University of Technology
Priority date: 2011-05-25
Filing date: 2011-05-25
Publication date: 2011-08-31
Anticipated expiration: 2031-05-25
Also published as: CN102170704B

Abstract

The invention provides an uplink multi-cell base station cooperative user scheduling method, which belongs to the field of wireless information transmission. When a user terminal on the edge of a cell communicates with a destination serving base station, the terminal may produce interference on the base station of a neighbor cell. The serving base station selects a user with the least interference on the adjacent base station as a communication user by cooperative processing among the base stations, and allocates a timeslot to the user for signal transmission, so interference among the cells is reduced. By the method, the selected scheduled user can be ensured to produce the least interference on the other cells.

Description

A kind of up multi-cell base station collaboration user dispatching method

Technical field

The invention belongs to the wireless messages transmission field, particularly adopt the system of the standard such as WLAN (wireless local area network), broadband wireless access, mobile communication, ground digital television broadcast of multi-antenna technology.

Background technology

Along with the fusion gradually of wireless network, multimedia technology and Internet, people are more and more higher to the requirement of the type of radio communication service and quality.For satisfying the requirement of radio multimedium and high speed data transfers, need the Development of New Generation wireless communication system, as 3G, LTE-Advanced etc.

Present 3G and LTE-Advanced system have adopted CDMA and OFDM technology respectively, can realize identical networking.They make the information-bearing of user in the sub-district on mutually orthogonal spreading code or orthogonal sub-carriers, can reduce the interference of the multiple access between the user in the sub-district greatly.But for Cell Edge User, useful signal intensity is little, and is big from the interference signal intensity of neighbor cell, this letter drying that has reduced Cell Edge User is than (SINR), cause its throughput to descend, make edge customer can not obtain satisfied service, seriously restricted systematic function.Therefore, presence of intercell interference suppresses to become the mobile radio networks problem demanding prompt solution.

At present, propose more wireless network dl interference inhibition technology, but the presence of intercell interference reduction method at up link has seldom been arranged, and be generally limited to the processing of single sub-district.Based on this, the user that the present invention proposes the associating of a kind of multi-cell base station dispatches treatment technology, and it is low and be easy to the advantage of Project Realization that it has complexity.

Summary of the invention

The object of the present invention is to provide a kind of low complex degree uplink cells method for reducing interference between that is easy to Project Realization.

Thought of the present invention is: when the user terminal that is in cell edge was communicated by letter with its serving BS, this user terminal can cause interference to the adjacent base station (disturbed base station) of serving BS; If at a certain time slot, select to disturb less user to send signal to adjacent base station, then can reduce the interference between the sub-district.

For convenience of description, define every community user terminal j ∈ 1, L, N}, serving BS i ∈ 1, L, K}, disturbed base station k ∈ { 1, L, i-1, i+1, L, K}, wherein N is the maximum user terminal number in every sub-district, K is a maximum service base station number, and the sub-district at serving BS i place is defined as cell i,,, the channel condition information between the user j of cell i and this cell i serving BS i is Channel condition information between the disturbed base station k of user j-neighbor cell of cell i is

Particularly, the implementation step of method proposed by the invention is as follows, as shown in Figure 1.

The first step: user terminal j is to serving BS i and the adjacent disturbed base station k pilot symbol transmitted thereof of affiliated subdistrict i; 101

Second step: disturbed base station k calculates channel condition information between user terminal j and the disturbed base station k according to pilot signal

And the mould value square

Be designated as the channel gain size, with its tolerance of adjacent base station being disturbed as this user; 102

The 3rd step: disturbed base station k is the interference metric between user j and the disturbed base station k

Be sent to serving BS i end by wireless or wire link; 103

The 4th step: serving BS i calculate each user terminal j to the value of disturbed base station k interference metric and

104

The 5th step: serving BS i selects minimum total pairing user of interference metric as dispatched users, and distributes time slot to initiate communication to dispatched users.105

The present invention can guarantee that by simple co-operation between serving BS and the disturbed base station dispatched users of selecting is minimum to the interference that cause other sub-districts when communication.

Description of drawings

The scheduling implementation step of a kind of up multi-cell base station collaboration user dispatching method of Fig. 1;

Fig. 2 two area interference examples;

Fig. 3 three area interference examples.

Execution mode

Be described further for the present invention below in conjunction with the drawings and specific embodiments.

Embodiment 1:

With simple two cell-radio networks is the example explanation, and in described two cell communication systems, a base station is contained in every sub-district, as shown in Figure 2.User side UE1 communicates by letter with the base station node B1 that belongs to sub-district 1 in the sub-district 1, and user side UE2 also communicates by letter with the base station node B1 that belongs to sub-district 1 in the sub-district 1.Simultaneously, the UE1 x1 that transmits can cause interference to the base station node B2 of sub-district 2, and the UE2 x2 that transmits can cause interference to the base station node B2 of sub-district 2.To time division multiplex system, at a certain time slot T, base station node B1 need determine that scheduling UE1 still is that UE2 sends signal and base station communication.

At first, each user terminal UE1 and UE2 are to the serving BS Node B1 and the adjacent disturbed base station node B2 pilot symbol transmitted thereof of affiliated subdistrict.

Then, disturbed base station node B2 calculates channel condition information between user and the disturbed base station respectively according to pilot signal, as the channel condition information between UE1 and the Node B2 in the sub-district 1 Channel condition information in the sub-district 1 between UE2 and the Node B2 Suppose its mould value square It represents the interference metric that UE1 and UE2 cause adjacent base station Node B2, i.e. channel gain size respectively.

Then, disturbed base station end Node B2 user UE1 and UE2 to its interference value

Be sent to serving BS Node B1 end.

At serving BS Node B1 end, calculate user UE1 and UE2 respectively adjacent base station is disturbed sum, adjacent base station is base station node B2 only here, is respectively 1.2 and 1.06.

At last, base station node B1 selects minimum total pairing user UE2 of disturbed one .06 as dispatched users, and distributes this time slot to initiate communication for dispatched users UE2.

Embodiment 2

Be the example explanation with typical three area interference wireless networks below, in described three cell communication systems, a base station is contained in every sub-district.User side UE1 communicates by letter with the base station node B1 that belongs to sub-district 1 in the sub-district 1, and user side UE2 also communicates by letter with the base station node B 1 that belongs to sub-district 1 in the sub-district 1.Simultaneously, the UE1 x1 that transmits can cause interference to base station node B2, the Node B3 of sub-district 2,3, and the UE2 x2 that transmits can cause interference to base station node B2, the Node B3 of sub-district 2,3.To time division multiplex system, at a certain time slot T, base station node B1 need determine that scheduling UE1 still is that UE2 transmission signal is communicated by letter with base station node B1.

At first, each user terminal UE1 and UE2 are to the serving BS Node B1 of affiliated subdistrict and adjacent disturbed base station node B2 thereof, Node B3 pilot symbol transmitted.

Then, disturbed base station node B2, Node B3 calculate channel condition information between user and the disturbed base station respectively according to pilot signal, are respectively as the channel condition information between UE1 and Node B2, the Node B3 in the sub-district 1

Channel condition information in the sub-district 1 between UE2 and Node B2, the Node B3

Suppose that its mould value square is respectively

It represents the interference metric that UE1 and UE2 cause adjacent base station Node B2, Node B3, i.e. channel gain size respectively.

Be sent to serving BS Node B1 end; Disturbed base station end Node B3 user UE1 and UE2 to its interference value

Be sent to serving BS Node B1 end.

At serving BS Node B1 end, calculate user UE1 and UE2 respectively adjacent base station is disturbed sum, wherein, UE1 to the interference of Node B2, Node B3 is

UE2 to the interference of Node B2, Node B3 is

At last, base station node B1 selects minimum total 2.18 pairing user UE2 of interference as dispatched users, and distributes this time slot to initiate communication for dispatched users UE2.

Can see that in up link, the user scheduling method that adopts the present invention to propose can reduce the interference of user to neighbor cell, and institute's extracting method is easy to Project Realization.

Claims

1. up multi-cell base station collaboration user dispatching method, when the user terminal that is in cell edge was communicated by letter with its serving BS, this user terminal can be that interference is caused in disturbed base station to the adjacent base station of serving BS; At a certain time slot, select to disturb less user to send signal to adjacent base station, reduced the interference between the sub-district; It is characterized in that:

Define every community user terminal j ∈ 1, L, N}, serving BS i ∈ { 1, L, K}, disturbed base station k ∈ { 1, L, i-1, i+1, L, K}, wherein N is every sub-district maximum number of user, K is a maximum service base station number, and serving BS i sub-district is defined as cell i,,, the channel condition information between the user j of cell i and this cell i serving BS i is

Channel condition information between the disturbed base station k of user j-neighbor cell of cell i is

The implementation step of described method is as follows:

The first step: user terminal j is to serving BS i and the adjacent disturbed base station k pilot symbol transmitted thereof of affiliated subdistrict i;

And the mould value square

Be designated as the channel gain size, with its tolerance of adjacent base station being disturbed as this user;

Be sent to serving BS i end by wireless or wire link;

The 5th step: serving BS i selects minimum total pairing user of interference metric as dispatched users, and distributes time slot to initiate communication to dispatched users.