CN100428837C

CN100428837C - Wireless link link-dismantling policy optimizing method

Info

Publication number: CN100428837C
Application number: CNB2004100790779A
Authority: CN
Inventors: 黄心晔; 许亮
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2004-09-29
Filing date: 2004-09-29
Publication date: 2008-10-22
Anticipated expiration: 2024-09-29
Also published as: CN1756417A

Abstract

The present invention relates to a strategy optimization method for removing wireless links, the method comprises that two or more than two uplink sets exist between a base station (Node B) and user equipment (UE); a radio network controller (RNC) obtains the link quality of the link sets; if the link quality of a certain link set goes bad, the RNC deletes the link set. Before the link set is deleted from the quality goes bad, the corresponding Node B sends an emission power control command word for controlling up emission power to rise slowly to the UE. The method of the present invention fundamentally solves the problem that the up quality of good links goes bad for the up TPC command word of bad links caused by up quality difference when two or more than two uplink sets simultaneously exist. Meanwhile, when only one link set exists, the up emission power can not rapidly rise by the method for sending Patterns.

Description

A kind of wireless link link-dismantling policy optimizing method

Technical field

The present invention relates to wireless communication field, refer to a kind of wireless link link-dismantling policy optimizing method especially.

Background technology

In the WCDMA system, regulation according to agreement 25.214, the physical layer link failure start-up course of up link is as follows: base station (Node B) is if receive that continuously N_OUTSYNC_IND (can be joined parameter, specifically be provided with reference to agreement) step-out primitive, Node B will start one and tear chain timer T_RLFAILURE open, during the T_RLFAILURE timing, if Node B receives that continuously N_INSYNC_IND (can be joined parameter, specifically be provided with reference to agreement) synchronization primitives, NodeB will stop the timing of T_RLFAILURE, if T_RLFAILURE is overtime, Node B will trigger RL Failure (Radio Link Failure) process, simultaneously, the state-transition of Radio Link collection is the step-out attitude.In case RL Failure failure procedure is triggered, the Radio Link collection enters tears the chain flow process open, and RNC (Radio Network Controller, radio network controller) deletes the Radio Link collection by certain signaling process.The value of T_RLFAILURE generally is taken as a second level.

From top description as can be seen, worsen, finally deleted to this link from uplink quality, the centre will through one second level time, this can cause following problem:

As shown in Figure 1, in soft handover and the same direct-cut operation frequently, might there be two up link set RLS1 and RLS2 simultaneously, suppose that the RLS1 quality is very poor, but because the value of the T_RLFAILURE of configuration is a second level, deletion RLS1 also needs second time of level.

Distinguish for convenient, we are defined as descending TPC (Transmit Power Control, transmitting power control) command word and up TPC command word to two power control commands words of control NodeB transmitting power size and UE transmitting power size respectively.It comprises: power falls in 0 or 1,0 representative, and 1 represents power per liter.If the channel quality of link set RLS2 is normal, two link set send up TPC command word to UE simultaneously, and this moment, the power control strategy of UE optimum was that up TPC according to RLS2 carries out power control.But, according to the regulation of agreement, under the good condition of two down channel qualities, have only all power per liter of two up TPC command words, just can raise oneself transmitting power of UE, above-mentioned two up TPC command words have four kinds of combinations: 00,01,10,11.One of front is the TPC command word that RLS1 corresponding district NodeB1 sends, one of back be RLS2 corresponding district NodeB2 send with the TPC command word.In these four kinds of combinations, UE only received 11 o'clock, and oneself transmitting power just can raise.And under present case, the power control strategy that RLS1 adopts has two kinds: a kind of is to send out complete 1, and a kind of is a Pattern.Describe respectively below:

Situation 1: under the scene of Fig. 1, if the up TPC command word of ropy link set RLS1 correspondence sends complete 1, be to carry out uplink power control according to the needs of the measured link set RLS2 of matter, but, under many circumstances, NodeB can't know same UE, there are several link set in the air interface actually, therefore, even have only 1 link set, NodeB also must adopt such power control strategy, and CDMA is a self-interference system, the signal of a UE is exactly other users' interference, and the TPC command word is that 1 representative rises 1dB.1 time slot of power control commands word is sent out one, 1 time slots is 2/3ms, 1s can send out 1500 power control commands words, like this, UE power in a short period of time will be raised to maximum, if UE launches with full power, can bring great interference to other users in the sub-district, have a strong impact on cell capacity, therefore, thisly send out 1 strategy complete and should avoid as far as possible.

Situation 2: if General N odeB finds the link set poor quality, it can send out a pattern: i.e. 010101010101....011,0 and 1 staggered sending out rises 1dB and falls 1dB again, some to 01 after, one 1 of pilosity.Be actually the strategy of having realized a slow power per liter.So: under the scene of Fig. 1, because current RLS2 is normal, the TPC command word sent out to UE of RLS2 corresponding district NodeB2 rises and the number of falling is roughly suitable so, and this moment, RLS1 corresponding district NodeB1 sent out 1 Pattern, according to the power control strategy of UE when two Radio Link collection exist, at this time, in fact UE be the number of times of power falls and can be more than the number of times of power per liter.Therefore, transmitting power for the RLS2 needs, the transmitting power of UE is on the low side, because the time of a deletion RLS1 needs level second, therefore, the time that this is on the low side will last very long, the consequence that it will bring the RLS2 uplink loss even tear chain open, this consequence is very serious, because RLS1 also is very poor, two link set are all poor, and the user just may call drop.

As seen from the above analysis, in fact whether unique according to the link set number that exists in the air interface when a certain wireless links collection degradation, be to have two kinds of distinct optimum uplink power control strategies.When link set was unique in the air interface, sending out Pattern was optimal policy; At soft handover with in the frequency direct-cut operation, there are two Radio Link collection (or more) simultaneously, if up quality 1 is bad, it is optimum power control strategy that the link set that quality is bad sends complete 1.And NodeB oneself can't distinguish this two states, can only two selects one, no matter selects anyly, must reach global optimum.

Summary of the invention

The invention provides the wireless link link-dismantling policy optimizing method of the efficient operation of safeguards system.

A kind of wireless link link-dismantling policy optimizing method provided by the invention comprises:

Have two or more up link collection between NodeB and UE, RNC obtains the link-quality of those link set; If the link-quality variation of a certain link set wherein, RNC is immediately with this link set deletion; Before deleted, its corresponding NodeB sends the emissive power control command word that its uplink transmission power of control rises slowly to UE in this link set degradation; And,

Have only a link set between NodeB and UE, during the uplink quality variation of this link set, its corresponding NodeB sends the emissive power control command word that its uplink transmission power of control rises slowly to UE.

According to said method of the present invention, described emissive power control command word is the Pattern command word.

According to said method of the present invention, between NodeB and UE, there is two or more up link collection, RNC obtains the link-quality of those link set, determines the link-quality variation of a certain link set, specifically comprises:

RNC receives the step-out primitive that NodeB reports;

When the number of the continuous step-out primitive of link set surpasses a preset value, judge respective links collection degradation.

RNC regularly obtains the Radio Link error rate, Block Error Rate and/or the signal to noise ratio that NodeB reports;

When the described Radio Link error rate, Block Error Rate and/or signal to noise ratio surpass or be lower than a certain preset value, determine respective links collection degradation.

The inventive method has fundamentally solved when having two or more up link collection simultaneously, because the up TPC command word of the poor link that causes of up mass discrepancy has made the problem of the up degradation of link.Simultaneously, when only having a link set, make uplink transmission power can not rise rapidly by the method that sends Pattern.

Description of drawings

Fig. 1 concerns schematic diagram between base station and the travelling carriage under the switching state.

Embodiment

If when having two or more link set between NodeB and the UE, RNC obtains the link-quality of those link set, when the up degradation of a link set wherein, RNC is immediately with this link set deletion, and do not need through one second level time, at this moment, during deleted, the up TPC command word of corresponding district sends Pattern to ropy link set in its degradation.

When having only a link set between NodeB and the UE, if the uplink quality variation of this link set, its corresponding NodeB sends up TPC command word Pattern to UE, and the chain timer time of tearing open of dispensing NodeB is a second level under the RNC.

The quality that detects up link is that the NodeB by the link set correspondence carries out, the quality of up link is actually the business information transmitted on the up link and the quality of control information, this quality can be weighed by the Block Error Rate and the error rate of these information, business information has the quality indication bit, can obtain the Block Error Rate of business information by it, though control information does not have the quality indication bit, also can obtain the error rate by other indirect modes; Can also recently weigh the quality of up link simultaneously by the noise of measuring business information and control information.Judge that link set is of poor quality, generally can be by thresholding be set, such as: can think the error rate 40% for of poor quality, link set that simultaneously also can be different in a word, can adopt several different methods and standard to judge the quality of link-quality with different thresholdings.

RNC also has the method for link set deletion much immediately, and a kind of optional scheme is: under the RNC chain timer T_RLFAILURE time of tearing open of dispensing NodeB variable, when up when only having 1 RLS, this time parameter of tearing the chain timer open is configured to second grade; When up when having two or more RLS, this time parameter of tearing the chain timer open is configured to little value (less than 1 second arbitrary value, for example 0), that is to say, in case the up degradation of certain link set, deletion immediately, when tearing open to such an extent that only be left 1 RLS, revert to a second level.The time that is provided with of timer is at all link set of same UE, and when a plurality of link set, the little value time is provided with at all link set, when tearing open to such an extent that have only 1 link set, and corresponding this remaining link set of second level time.

Another scheme is: when having a plurality of link set, need not to be provided with the time when up, tear chain timer T_RLFAILURE open in case start, RNC by signaling immediately with this link circuit deleting; Or will tear that chain timer expiry information reports RNC open or behind this timer expiry, start the Radio Link Failure process by NodeB, the wherein said chain timer time parameter of tearing open is the arbitrary value less than 1 second; RNC deletes this link set by signaling after receiving reporting information or after the startup of Radio Link Failure process.

Also have a kind of scheme to be: the NodeB RNC that directly step-out primitive reported for work, RNC surpass a preset value according to the number of step-out primitive continuously and judge the link set degradation, delete link set immediately.

Also have a kind of scheme to be: RNC is according to the Radio Link collection quality situation (according to present agreement, RNC can obtain part Radio Link collection quality information) that has obtained, directly by signaling deletion link set; Or NodeB reports RNC with the quality of Radio Link collection, and whether RNC decides in its sole discretion according to these information and the Radio Link collection is deleted.

The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claims.

Claims

1, a kind of wireless link link-dismantling policy optimizing method is characterized in that comprising:

Have two or more up link collection between base station node B and user equipment (UE), radio network controller (RNC) obtains the link-quality of those link set; If the link-quality variation of a certain link set wherein, RNC is immediately with this link set deletion; Before deleted, its corresponding NodeB sends the emissive power control command word that its uplink transmission power of control rises slowly to UE in this link set degradation; And,

2, the method for claim 1 is characterized in that: described emissive power control command word is the Pattern command word.

3, the method for claim 1 is characterized in that: have two or more up link collection between NodeB and UE, RNC obtains the link-quality of those link set, determines the link-quality variation of a certain link set, specifically comprises:

RNC receives the step-out primitive that NodeB reports;

4, the method for claim 1 is characterized in that: have two or more up link collection between NodeB and UE, RNC obtains the link-quality of those link set, determines the link-quality variation of a certain link set, specifically comprises: