CN101174884B - Accidental access method for Time Division-Synchronous Code Division Multiple Access system - Google Patents
Accidental access method for Time Division-Synchronous Code Division Multiple Access system Download PDFInfo
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- CN101174884B CN101174884B CN2006101380198A CN200610138019A CN101174884B CN 101174884 B CN101174884 B CN 101174884B CN 2006101380198 A CN2006101380198 A CN 2006101380198A CN 200610138019 A CN200610138019 A CN 200610138019A CN 101174884 B CN101174884 B CN 101174884B
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Abstract
The present invention discloses a random access method of time division synchronous code division multiple access system which is based on the distributed antennae; the method comprises the following processing that every antenna unit of the base station of the time division synchronous code division multiple access system implements the relevant operations on received random access signal and uplink synchronous code to obtain the corresponding result sequence; the relevant result sequence obtained by every antenna unit is processed to judge whether the user device which uses the uplink synchronous code for uplink access exists on every antenna unit; with the judging result, people decide whether to arrange a downlink forward-link physical access channel for the uplink synchronous code. With the technical proposal, at least two of the following beneficial effects are realized that the probability of system access conflict is reduced and the success rate of system access is increased.
Description
Technical field
The present invention relates to a kind of wireless communication technology technology; And especially; The accidental access method that relates to a kind of TD-SCDMA system (TD-SCDMA, TimeDivision-Synchronous Code Division Multiple Access) based on spaced antenna.
Background technology
The uplink synchronous process of being initiated by subscriber equipment in the TD-SCDMA system is (referring to Fig. 1) as follows: 1. each user terminal sends the specific up access signal that comprises uplink random synchronous code (SYNC UL) in up link; 2. the base station obtains the up timing information of each user terminal through the detection to each uplink synchronous accidental access signal, and the base station is transmitted timing adjustment information through specific down channel (FPACH, forward physical access channel) to each user terminal again; 3. the own timing of information adjustment that issues according to the base station of each user is gone up access at specific access channel (RACH).
In the conventional TD-SCDMA sub-district of using smart antenna, if two or more user has selected same pseudo random sequence code and same base station to insert simultaneously in same frame, the conflict in the time of will causing the user to insert at random.Under above-mentioned conflict situations, if the normal user terminal that clashes of responding in base station, then conflicting can continue this conflict between user and the base station always, and the signaling access procedure of meeting EVAC causes the decline of whole system access performance.
Existing TD-SCDMA always hopes the base station to detect the situation that there is conflict in a plurality of user terminals; And a plurality of users that when conflict takes place, make conflict reselect the uplink synchronous code delay and send out; To dissolve up access interference, guarantee the whole access effect of system, in the macro base station environment; The bigger probability of up access signal of the subscriber equipment of conflict has tangible difference in time, thereby to the detection of up conflict possibility is provided.
The occasion that has Microcell for indoor environment etc. in a large number; In order to reach the covering purpose; Intensive outfit is not a good solution based on the base station equipment of smart antenna, has many-sided problems such as switching, cost, performance, at present to these problems; The TD-SCDMA base station that the use spaced antenna occurred replaces the equipment of a plurality of little base stations; This base station based on spaced antenna links to each other with a plurality of antenna elements (antenna element possibly comprise one or several antennas), and one or several antenna elements are responsible for covering the scope that original little base station need cover, and the isolation of building is generally arranged between the antenna element.GSM applied scene when floor covers that TD-SCDMA base station based on spaced antenna replaces a plurality of Microcells to communicate by letter with a plurality of UE shown in Fig. 2; Each antenna channels covers different floors among the figure, isolates through floor between the antenna element.
For the TD-SCDMA base station equipment based on spaced antenna, conventional access and conflict processing method will be no longer suitable.With the TD-SCDMA base station applies based on spaced antenna is example when floor covers; Different element antennas is covered with different floors; Though the subscriber equipment of different floors still belongs to a sub-district; But each subscriber equipment possibly communicated by letter with base station equipment through the different antennas unit at different floors; If the subscriber equipment of different floors has selected same pseudo random sequence code and base station to insert in same frame; The problem that the base station uses conventional access and conflict processing method to have two aspects at least: (1) base station is difficult to judge user's access interference again; Utilize distributed antenna element region covered generally not have very big areal extent; The distance of each antenna element and affiliated subscriber equipment is roughly suitable, and the environmental quality at each subscriber equipment place is also roughly the same, signal characteristic that the subscriber equipment of the detected several different floors in base station inserts with same pseudo random sequence code and base station in same frame and the generally not significantly difference of signal characteristic of having only a user to insert at a certain antenna element; (2) " subscriber equipment of different floors has selected same pseudo random sequence code to insert with the base station in same frame " though the uplink synchronous code of this situation conflict; But descending FPACH is owing to issue through the different antennas unit; Therefore in fact not conflict, base station are sought unity of action to such user and are reselected the chance that in fact processing that the uplink synchronous code delay sends out has again wasted user's up access.
Can find out that through foregoing the access effect of existing TD-SCDMA base station based on spaced antenna is relatively poor, the probability of system's access interference is bigger, and inserts success rate, not high, therefore, needs a kind of technical scheme that addresses the above problem.
Summary of the invention
Main purpose of the present invention is to provide the accidental access method of a kind of TD-SCDMA system (TD-SCDMA), and it can increase the access effect based on the TD-SCDMA base station of spaced antenna.
To achieve these goals, the invention provides a kind of accidental access method of the TD-SCDMA system based on spaced antenna.
This method may further comprise the steps: first step on each antenna element of TD-SCDMA system base station, obtains corresponding correlated results sequence through the accidental access signal that receives is carried out associative operation with a uplink synchronous code; Second step is handled the correlated results sequence that on each antenna element, obtains, to judge on each antenna element, whether the having subscriber equipment that uses uplink synchronous code to carry out up access; And third step, whether decision arranges descending forward physical access channel to uplink synchronous code according to the judged result in second step.
In first step, accidental access signal is the accidental access signal that comprises the user terminal of uplink synchronous code, and uplink synchronous code is included in the local up access signal code character.
In addition, in third step,, then uplink synchronous code is not arranged descending forward physical access channel if in second step, judge the subscriber equipment that does not exist the use uplink synchronous code to carry out up access on all antenna elements; If in second step, judging to have only exists the subscriber equipment that uses uplink synchronous code to carry out up access on the antenna element, then uplink synchronous code is arranged descending forward physical access channel, and only issue the forward physical access channel at this antenna element; If in second step, judge to have and all have the subscriber equipment that uses uplink synchronous code to carry out up access on a plurality of antenna elements; Then uplink synchronous code is arranged descending forward physical access channel, and issue the forward physical access channel at the strongest antenna element of the received power of uplink synchronous code.
Wherein, In above-mentioned processing; Correlated results sequence the strongest antenna element of selective reception power from a plurality of antenna elements according to each antenna element that in first step, obtains; More specifically, come the strongest antenna element of selective reception power according to the correlation peak effective value in the correlated results sequence of a plurality of antenna elements and/or effective average of comprising in the 2-8chip interval of correlation peak.
Pass through technique scheme; The present invention has realized following beneficial effect: judge the detection accomplished conflict and evade through antenna; The user who on the different antennas unit, initiates to insert has avoided owing to conflict causes the waste that inserts chance; Reduce the probability of system's access interference, improved the success rate that inserts on the whole.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the sketch map that illustrates according to the uplink synchronous process of in the TD-SCDMA system, being initiated by subscriber equipment of correlation technique;
Fig. 2 is the sketch map based on the TD-SCDMA base station of spaced antenna that illustrates according to correlation technique;
Fig. 3 is the flow chart based on the accidental access method of the TD-SCDMA system of spaced antenna according to the embodiment of the invention; And
Fig. 4 is the block diagram based on the accidental access device of the TD-SCDMA system of spaced antenna according to the embodiment of the invention.
Embodiment
Specify the present invention below with reference to accompanying drawing.
As shown in Figure 3, the method for describing in embodiments of the present invention may further comprise the steps:
Step S302 on each antenna element of TD-SCDMA system (TD-SCDMA) base station, obtains corresponding correlated results sequence through the accidental access signal that receives is carried out associative operation with a uplink synchronous code S; Wherein, accidental access signal is the accidental access signal that comprises the user terminal of uplink synchronous code, and uplink synchronous code S (can be any in 8) is included in the local up access signal code character;
Step S304 handles the correlated results sequence that on each antenna element, obtains, in step S306, to judge on each antenna element, whether the having subscriber equipment that uses uplink synchronous code S to carry out up access;
And step S308, whether decision arranges descending FPACH (forward physical access channel) to uplink synchronous code S according to the judged result in step S306.
Particularly, step S308 comprises following operation:
On in step, judging all antenna elements, there be not when using the subscriber equipment that uplink synchronous code S carries out up access (, among the step S306 not), then proceed to step S308-2, uplink synchronous code S is not arranged FPACH;
When judgement in step S306 has only the subscriber equipment that existence use uplink synchronous code S carries out up access on the antenna element (; Among the step S306-2 one); Then proceed to step S308-4, uplink synchronous code S is arranged descending FPACH, and only issue FPACH at this antenna element;
Have when all having the subscriber equipment that use uplink synchronous code S carries out up access on a plurality of antenna elements when in step S306, judging (; A plurality of among the step S306-2); Then proceed to step S308-6; Uplink synchronous code S is arranged descending FPACH, and issue FPACH at the strongest antenna element of the received power of uplink synchronous code.
Especially; In above-mentioned steps S308-6; Correlated results sequence the strongest antenna element of selective reception power from a plurality of antenna elements according to each antenna element that in step S302, obtains; More specifically, come the strongest antenna element of selective reception power according to the correlation peak effective value in the correlated results sequence of a plurality of antenna elements and/or effective average of comprising in the 2-8chip interval of correlation peak.
In addition, respectively all uplink synchronous codes (being 8 at present) in the up access signal code character of this locality are carried out above-mentioned each treatment step, until all uplink synchronous codes in the up access signal code character are all made the decision of whether arranging FPACH.
Below will describe the accidental access device based on the TD-SCDMA system of spaced antenna according to the embodiment of the invention with reference to accompanying drawing 4, wherein, Fig. 4 is the block diagram that this apparatus structure is shown.
As shown in Figure 4; The accidental access device 400 of this TD-SCDMA system comprises: the correlated results sequence is obtained portion 402; On each antenna element of TD-SCDMA system base station; Through an accidental access signal and a uplink synchronous code (for example, uplink synchronous code S) that receives carried out the correlated results sequence that associative operation obtains correspondence; Correlated results series processing portion 404 is used for the correlated results sequence of being obtained portion's 402 acquisitions by the correlated results sequence is handled, to judge on each antenna element, whether the having subscriber equipment that uses uplink synchronous code to carry out up access; And descending forward physical channels arrangement portion 406, be used for uplink synchronous code being arranged descending FPACH (forward physical access channel) according to the judged result of correlated results series processing portion 404.
Wherein, it is the accidental access signal that comprises the user terminal of uplink synchronous code that the correlated results sequence is obtained the accidental access signal that portion 404 operates on it, and uplink synchronous code is included in the local up access signal code character.
Especially; Do not have the subscriber equipment that uses uplink synchronous code to carry out up access on all antenna elements if correlated results series processing portion 404 is judged, 406 pairs of uplink synchronous codes of then descending forward physical access channel scheduling portion are not arranged descending forward physical access channel; If judging to have only, correlated results series processing portion 404 has the subscriber equipment that uses uplink synchronous code to carry out up access on the antenna element; 406 pairs of uplink synchronous codes of then descending forward physical access channel scheduling portion are arranged descending forward physical access channel, and only issue the forward physical access channel at this antenna element; If judging to have, correlated results series processing portion 404 all has the subscriber equipment that uses uplink synchronous code to carry out up access on a plurality of antenna elements; 406 pairs of uplink synchronous codes of then descending forward physical access channel scheduling portion are arranged descending forward physical access channel, and issue the forward physical access channel at the strongest antenna element of the received power of uplink synchronous code.
In aforesaid operations; Descending forward physical access channel scheduling portion 406 obtains correlated results sequence the strongest antenna element of selective reception power from a plurality of antenna elements of each antenna element that portion 402 obtains according to the correlated results sequence; More particularly, descending forward physical access channel scheduling portion 406 comes the strongest antenna element of selective reception power according to the correlation peak effective value in the correlated results sequence of a plurality of antenna elements and/or effective average of comprising in the 2-8chip interval of correlation peak.
Can find out through above description; The advantage of in preceding text, having described; Combine through the antenna judging process is handled with the emission of FPACH, guaranteed up access success rate and performance when the next user's of some environment up access signal is received by two different antennas unit simultaneously simultaneously.
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. the accidental access method of a TD-SCDMA system is characterized in that, may further comprise the steps:
First step on each antenna element of TD-SCDMA system base station, obtains corresponding correlated results sequence through the accidental access signal that receives is carried out associative operation with a uplink synchronous code;
Second step is handled the correlated results sequence that on each antenna element, obtains, to judge on each antenna element, whether the having subscriber equipment that uses said uplink synchronous code to carry out up access; And
Third step, whether decision arranges descending forward physical access channel to said uplink synchronous code according to the judged result in said second step.
2. the accidental access method of TD-SCDMA system according to claim 1; It is characterized in that; In said first step; Said accidental access signal is the accidental access signal that comprises the user terminal of uplink synchronous code, and said uplink synchronous code is included in the local up access signal code character.
3. the accidental access method of TD-SCDMA system according to claim 1; It is characterized in that; In said third step; If in said second step, judge not have the subscriber equipment that uses said uplink synchronous code to carry out up access on all antenna elements, then said uplink synchronous code do not arranged descending forward physical access channel.
4. the accidental access method of TD-SCDMA system according to claim 1; It is characterized in that; In said third step; If in said second step, judging to have only exists the subscriber equipment that uses said uplink synchronous code to carry out up access on the antenna element, then said uplink synchronous code is arranged descending forward physical access channel, and only issue the forward physical access channel at this antenna element.
5. the accidental access method of TD-SCDMA system according to claim 1; It is characterized in that; In said third step; If in said second step, judging to have all exists the subscriber equipment that uses said uplink synchronous code to carry out up access on a plurality of antenna elements, then said uplink synchronous code is arranged descending forward physical access channel, and issue the forward physical access channel at the strongest antenna element of the received power of said uplink synchronous code.
6. the accidental access method of TD-SCDMA system according to claim 5; It is characterized in that; In said third step, from said a plurality of antenna elements, select the strongest antenna element of said received power according to the correlated results sequence of each antenna element that in said first step, obtains.
7. the accidental access method of TD-SCDMA system according to claim 6; It is characterized in that, select the strongest antenna element of said received power according to the correlation peak effective value in the correlated results sequence of said a plurality of antenna elements and/or effective average of comprising in the 2-8chip interval of correlation peak.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2006101380198A CN101174884B (en) | 2006-11-02 | 2006-11-02 | Accidental access method for Time Division-Synchronous Code Division Multiple Access system |
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| CN2006101380198A CN101174884B (en) | 2006-11-02 | 2006-11-02 | Accidental access method for Time Division-Synchronous Code Division Multiple Access system |
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| CN101174884B true CN101174884B (en) | 2012-03-14 |
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| CN102098794B (en) * | 2011-01-30 | 2014-06-04 | 大唐移动通信设备有限公司 | Method and apparatus for processing random access collision |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1497882A (en) * | 2002-10-23 | 2004-05-19 | 华为技术有限公司 | Random insertion method fortime-division duplex system |
| CN1533203A (en) * | 2003-03-18 | 2004-09-29 | 大唐移动通信设备有限公司 | Method for detecting multiple user's terminal random cutrin conflict |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1497882A (en) * | 2002-10-23 | 2004-05-19 | 华为技术有限公司 | Random insertion method fortime-division duplex system |
| CN1533203A (en) * | 2003-03-18 | 2004-09-29 | 大唐移动通信设备有限公司 | Method for detecting multiple user's terminal random cutrin conflict |
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