CN1596020A - Method of accessing target base station for mobile terminal switching between base stations - Google Patents
Method of accessing target base station for mobile terminal switching between base stations Download PDFInfo
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- CN1596020A CN1596020A CN 03157038 CN03157038A CN1596020A CN 1596020 A CN1596020 A CN 1596020A CN 03157038 CN03157038 CN 03157038 CN 03157038 A CN03157038 A CN 03157038A CN 1596020 A CN1596020 A CN 1596020A
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- 230000005540 biological transmission Effects 0.000 description 3
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- 238000004891 communication Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
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Abstract
The invention is a method for mobile terminal accessing target base station in switch between base stations. The method is: the mobile terminal uses the access resource designated by the target base station to access the target base station. The invention allocates part of the random access resource to switch user, thus guarantees the performance of switch user, at the same time, it upgrades the switch speed and success rate greatly.
Description
Technical field
The present invention relates to the mobile communication technology field, be meant that especially the portable terminal that switches inserts the method for target BS between the base station.
Background technology
Switching is that mobile communication is different from one of notable feature of fixed communication.When sub-district that the user uses or standard change, change such as FDD or TDD, think that promptly switching has taken place this user.
Generally, if system for synchronously, especially the requirement of uplink synchronous is than higher, after the user switches to Target cell, for avoiding other just causes interference at communication user in the Target cell, can not directly use the service resources in the Target cell so.At this moment, before being in the portable terminal of switching state and target BS and carrying out service interaction, need to adjust uplink transmission power of oneself and the timing relationship between self and the base station.Therefore, the system that uplink synchronous is had relatively high expectations receives when switching the user, must consider the interference problem to other user.Disturb for reducing, when portable terminal switches to target BS, must adjust relevant parameter through the process that inserts.
In general, the access way of sub-district can comprise two kinds, a kind of be in the sub-district original user for and the base station between mutual signaling or the business datum initial random access procedure of initiating; Another kind of be exactly switch from other sub-district that the user that comes initiates in order to adjust relevant parameter access procedure.
Be that example illustrates that the portable terminal that switches in the prior art inserts the method for target BS between the base station with the TD-SCDMA system below.
Referring to shown in Figure 1, its concrete access procedure is as follows:
Step 101, radio network controller (RNC) are by the topological structure of source base station to portable terminal broadcasting current network, and the notice portable terminal is measured the neighbor cell signal quality.
After step 102, portable terminal are received this notice, measure the signal quality of peripheral cell, and measurement result is reported to RNC.
After step 103, RNC receive the measurement result of mobile terminal reporting, judge whether this portable terminal needs to switch, if desired, then notify this portable terminal will switch to the Target cell of target BS by source base station, the notification target base station has the user of switching to insert simultaneously, otherwise jumps out this flow process.
Step 104, target BS receive that RNC sends have switch the notice that the user will insert after, check and whether also have available uplink synchronous code in this Target cell, if have, then can switch, and content of announcement also comprises relevant informations such as the power, timing of target BS by source base station notice portable terminal.
Step 105, this portable terminal receive target BS that send with relevant information this portable terminal after, it is synchronous to use uplink synchronous code to carry out initial uplink in the target BS competition, is linked into target BS then.At this moment, source base station can break and being connected of this portable terminal.
If target BS has not had operable uplink synchronous code in step 104, switch the user so and also must compete once more, obtain uplink synchronous code up to competition.Need to prove that in the TD-SCDMA system, uplink synchronous code is random access resource.And the user that will insert target BS can comprise initial random access the user, switch user etc.Therefore, all portable terminals that will insert target BS all will be competed the use random access resource simultaneously.Certainly, when system resource was nervous, once competition was unsuccessful probably, needed competition repeatedly.And also might long-time competition get nowhere, cause to insert target BS for a long time, finally cause packet loss.
In sum, when system to the requirement of uplink synchronous when higher, after portable terminal switches to the sub-district of target BS, for avoiding or reducing interference to other user, portable terminal need be set up uplink synchronous with target BS, and adjusts timing, transmitting power etc.Therefore, nervous if the service resources of target BS uses, after the switching user experiences a period of time possibly, could successfully insert target BS.This will cause the overlong time to user's service disruption, and quality of services for users is switched in influence, thereby cause that customers' satisfaction level descends.
Summary of the invention
In view of this, the purpose of this invention is to provide the method that a kind of portable terminal that switches inserts target BS between the base station, guarantee that the portable terminal that switches has access-in resource to use, and improves the access success rate of switching the user.
The method that a kind of portable terminal that switches between the base station provided by the invention inserts target BS comprises:
The portable terminal that switches between source base station and target BS utilizes the specified access-in resource of target BS to insert target BS.
Described access further comprises:
B1, portable terminal send the message that will switch to target BS to source base station; After source base station is received this message, this mobile terminal capability information and business information are sent to target BS;
After B2, target BS are received the ability information and business information of this portable terminal, for this portable terminal is specified random access resource;
B3, target BS are transmitted to this portable terminal with power, the timing information of specified access-in resource and local terminal by source base station; Power, timing information that this portable terminal sends according to target BS are adjusted transmitted power and timing, and utilize specified access-in resource to insert target BS.
Before portable terminal switches, further comprise:
A1, target BS mark off a part from the random access resource of fixed allocation, as switching the random access resource that the user can use.
Described step B2 further comprises:
B21, target BS are judged the random access resource that self whether has the switching user to use, if having, then select one from the random access resource that described switching user can use, access-in resource as this portable terminal, execution in step B3 then, otherwise, execution in step B22;
B22, judge the random access resource that the non-switching user in the random access resource that self whether also has fixed allocation can use, if having, then from wherein selecting one, as the access-in resource of this portable terminal, execution in step B3 then, otherwise, access failure.
Switch described in the steps A 1 user can with random access resource be from the access-in resource of fixed allocation, to divide according to certain rule.
Described certain rule is according to spread spectrum code word, time, frequency, space, or four combination in any preestablishes.
Marking off a part described in the steps A 1 from the random access resource of fixed allocation is to determine according to the ratio of switching all access users in the shared target BS of user in certain hour section internal object base station.
Marking off a part described in the steps A 1 from the random access resource of fixed allocation was undertaken by the cycle.
Set in advance the threshold value that inserts number of times, before portable terminal utilized the specified access-in resource of target BS to insert target BS, this method further comprised:
Judge and self insert number of times whether during,, then utilize the access-in resource of described appointment to insert target BS, otherwise access failure is jumped out this flow process if be not more than greater than described predefined threshold value;
The access threshold value of all portable terminals is inequality in the described base station.The present invention offers the part in the random access resource of fixed allocation to switch user's use specially, thereby has fully guaranteed to switch user's performance, greatly improves speed and the success rate of switching, minimizing packet loss simultaneously.
Description of drawings
Fig. 1 switches the schematic flow sheet that the user inserts target BS for prior art;
Fig. 2 is for realizing the schematic flow sheet of the inventive method;
Fig. 3 is the embodiment schematic diagram of the concrete divide resource of the present invention;
Fig. 4 is for realizing the specific embodiment schematic flow sheet of the inventive method.
Embodiment
For being increased in the access success rate of the portable terminal that switches between the base station, marking off a part in the random access resource of the present invention with fixed allocation and be specifically designed to the access-in resource that the switching user can use.
Referring to shown in Figure 2, realize that method of the present invention may further comprise the steps:
Step 201, from the random access resource of fixed allocation, mark off a part as switching the random access resource that the user can use.
The random access resource that portable terminal in step 202, the source base station utilizes the described switching user in the target BS to use inserts target BS.
The concrete division rule of resource can be set according to spread spectrum code word, time, frequency, space or its combination in any in the above-mentioned steps 201.Because access way comprises initial two kinds of accesses at random that insert at random and switch the user at random, therefore the random access resource of fixed allocation can be divided into two parts: a part is used for the initial random access of user in this sub-district, and another part is used to switch user's access at random.
Referring to shown in Figure 3, this figure comprises 3a, 3b, 3c, 3d four parts, represents four kinds of execution modes of divide resource of the present invention respectively.Wherein, Fig. 3 a is the mode according to the time divide resource, and Fig. 3 b is the mode according to the frequency partition resource, and Fig. 3 c is the mode according to the code word divide resource, and Fig. 3 d is the mode according to time domain and frequency domain divide resource.And n represents the sum of operable random access resource in this sub-district; K is the separation that is used for initial random access in n the operable random access resource and is used to switch user's access-in resource, and k＜n.Four kinds of modes shown in the figure all are that access-in resource 1～k is allocated to the initial user who inserts in the sub-district, and access-in resource (k+1)～n is distributed to the user who switches to this sub-district.
Describe technical scheme of the present invention in detail below in conjunction with the drawings and specific embodiments.
Present embodiment at first according to the ratio of switching user and the initial user of access in each time period in one period long period, is determined this sub-district access-in resource division proportion, again access-in resource is divided into two parts.Wherein, a part is used for the initial access at random of this community user, and another part is used to switch the access that the user can use.Certainly, system can set in advance cycle or the time of determining ratio, and constantly to carry out the self adaptation adjustment, this time can even carry out once for several hours, several days for more time, and the concrete time can be set by operator.
Referring to shown in Figure 4, the method that present embodiment realization switching user inserts target BS may further comprise the steps:
Holding consultation in portable terminal and base station in step 402, the sub-district, or independently determines measuring period or time;
After step 404, source base station received that this portable terminal will switch to the notice of target BS, necessary information notification target base station that will be relevant with this portable terminal specifically comprised the user capability information of this portable terminal correspondence and business information etc.;
After step 407, this portable terminal are received access-in resource information, timing and the power information of target BS, carry out timing adjustment according to this timing information, adjust the uplink transmission power of self according to this power information, and use the specified access-in resource of target BS to insert target BS.
In the said process, step 401 can be carried out according to the cycle, and it is lower that it carries out frequency, had only several times at most in general one day, or a few talent is once, or the longer time.And need only repeated execution of steps 402～step 407 in the concrete handoff procedure.In step 405, if target BS is determined self not switched the access-in resource that the user can use, can also take two kinds of situations this moment, a kind of situation is that this portable terminal is waited for a period of time, and then continue to judge whether to switch the access-in resource that the user can use in addition, if having, then give this portable terminal Resources allocation again, if no, access failure then; Another kind of situation is that target BS is given the initial random access-in resource from this cell allocation and taken out one, is used to switch user's access, and uses the initial random access user of this resource for this sub-district, and the base station will not respond.At this moment, for guaranteeing to switch the performance that the user can use, may cause the decline of access performance at random of this community user.
And the base station can be in advance be set and inserts the number of times threshold value for switching the user, if the user can not insert success in this thresholding number of times, and this user's handoff failure so.Certainly, the threshold value of each user's correspondence can equate, also can be unequal.In general, user's rank is high more, and its pairing threshold value also should be big more.
Need to prove, no matter soft handover or direct-cut operation, if this system to synchronously particularly uplink synchronous requirement is arranged, the user must carry out an access procedure so that adjust regularly and parameters such as power when switching to Target cell so.Therefore, method of the present invention goes for soft handover or direct-cut operation.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1, a kind of portable terminal that switches between the base station inserts the method for target BS, it is characterized in that this method comprises:
The portable terminal that switches between source base station and target BS utilizes the specified access-in resource of target BS to insert target BS.
2, method according to claim 1 is characterized in that, described access further comprises:
B1, portable terminal send the message that will switch to target BS to source base station; After source base station is received this message, this mobile terminal capability information and business information are sent to target BS;
After B2, target BS are received the ability information and business information of this portable terminal, for this portable terminal is specified random access resource;
B3, target BS are transmitted to this portable terminal with power, the timing information of specified access-in resource and local terminal by source base station; Power, timing information that this portable terminal sends according to target BS are adjusted transmitted power and timing, and utilize specified access-in resource to insert target BS.
3, method according to claim 2 is characterized in that, before portable terminal switches, further comprises:
A1, target BS mark off a part from the random access resource of fixed allocation, as switching the random access resource that the user can use.
4, method according to claim 3 is characterized in that, described step B2 further comprises:
B21, target BS are judged the random access resource that self whether has the switching user to use, if having, then select one from the random access resource that described switching user can use, access-in resource as this portable terminal, execution in step B3 then, otherwise, execution in step B22;
B22, judge the random access resource that the non-switching user in the random access resource that self whether also has fixed allocation can use, if having, then from wherein selecting one, as the access-in resource of this portable terminal, execution in step B3 then, otherwise, access failure.
5, method according to claim 3 is characterized in that, switch described in the steps A 1 user can with random access resource be from the access-in resource of fixed allocation, to divide according to certain rule.
6, method according to claim 4 is characterized in that, described certain rule is according to spread spectrum code word, time, frequency, space, or four combination in any preestablishes.
7, method according to claim 3, it is characterized in that marking off a part described in the steps A 1 from the random access resource of fixed allocation is to determine according to the ratio of switching all access users in the shared target BS of user in certain hour section internal object base station.
8, method according to claim 3 is characterized in that, marks off a part described in the steps A 1 and undertaken by the cycle from the random access resource of fixed allocation.
9, method according to claim 1 is characterized in that,
Set in advance the threshold value that inserts number of times, before portable terminal utilized the specified access-in resource of target BS to insert target BS, this method further comprised:
Judge and self insert number of times whether during,, then utilize the access-in resource of described appointment to insert target BS, otherwise access failure is jumped out this flow process if be not more than greater than described predefined threshold value;
10, method according to claim 9 is characterized in that, the access threshold value of all portable terminals is inequality in the described base station.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB031570380A CN100415028C (en) | 2003-09-11 | 2003-09-11 | Method of accessing target base station for mobile terminal switching between base stations |
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| CNB031570380A CN100415028C (en) | 2003-09-11 | 2003-09-11 | Method of accessing target base station for mobile terminal switching between base stations |
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| CN1596020A true CN1596020A (en) | 2005-03-16 |
| CN100415028C CN100415028C (en) | 2008-08-27 |
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