CN101198145B - User's set special intermediate code distribution method in time division duplex system - Google Patents
User's set special intermediate code distribution method in time division duplex system Download PDFInfo
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- CN101198145B CN101198145B CN2006101443708A CN200610144370A CN101198145B CN 101198145 B CN101198145 B CN 101198145B CN 2006101443708 A CN2006101443708 A CN 2006101443708A CN 200610144370 A CN200610144370 A CN 200610144370A CN 101198145 B CN101198145 B CN 101198145B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/50—Reducing energy consumption in communication networks in wire-line communication networks, e.g. low power modes or reduced link rate
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The present invention discloses a Midamble code allocation method specified by user equipment in a time division duplex system and is characterized by comprising that: a. powers of users are compared; b. the powers of the users are judged to be the same or similar; if yes, adjacent Midamble code offsets are allocated to the users with the same or similar powers; if not, the non-adjacent Midamble code offsets are allocated to the users with the different or non-similar powers. According to the difference of power sizes of the users and the judgment whether the powers of the users are the same or similar, the method of the present invention determines to allocate the Midamble code offsets with the adjacent or non-adjacent distance for the users. When the Midamble code offsets are allocated,the method of the present invention uses the principle of reducing interference between the users with different powers in order that the Midamble code offsets of the users with the same powers are adjacent and the Midamble code offsets of the users with the different powers have further distances, thereby reducing exit window leakage in the channel estimation. Through the method of the present invention, mutual influence between the users with different powers can be weakened in a certain degree and the accuracy of the channel estimation is improved.
Description
Technical field
The present invention relates to the tdd communication systems field, the distribution method of Midamble (intermediate code) in particularly a kind of TD-SCDMA (TimeDivision Synchronous CDMA) time division synchronous code division multiple access communication system.
Background technology
In tdd systems, Midamble (intermediate code) is called training sequence code again, and the centre that it is arranged in burst structure two data fields is used to carry out the maintenance of channel estimating, uplink synchronous and power measurement etc.The Midamble sign indicating number that different user is adopted in the same sub-district, in the same time slot is produced after cyclic shift by a basic Midamble sign indicating number, and main contents of the present invention are exactly the distribution method that is offset hereto.Clearly stipulated three kinds of allocation models of Midamble sign indicating number in the tdd systems in the 3GPP agreement 25.221, be respectively:
The specific intermediate code of subscriber equipment (subscriber equipment) (subscriber equipment Specific Midamble) pattern: clearly distribute a specific Midamble sign indicating number of upstream or downstream subscriber equipment by high level;
Default midamble (Default Midamble) pattern: uplink and downlink Midamble sign indicating number is distributed according to the channel code that is associated by layer 1 (physical layer);
Common midamble (Common Midamble) pattern: descending Midamble sign indicating number is determined according to the quantity of simultaneous channel code in the descending time slot by layer 1.
For stipulated in the specific midamble allocation mode protocol of subscriber equipment (subscriber equipment) can be with its part as channel resource, by high-rise flexible allocation, and its part as the physical channel configuration is indicated to subscriber equipment the most at last.The specific midamble allocation of subscriber equipment (subscriber equipment) can be placed on the distribution of channel code in the same process, carries out after channel code is distributed.
The specific midamble allocation pattern of subscriber equipment is not to be applicable to all occasions, there is certain service condition in this pattern in descending time slot, therefore before using the specific midamble allocation pattern of subscriber equipment, need following condition is judged, only have ready conditions and satisfy and could use:
A plurality of subscriber equipmenies use the physical channel of a descending time slot; And
All these physical channels have used wave beam forming; And
In all these physical channels any one all do not used Closed-Loop Transmit Diversity; Perhaps
PDSCH (physical down link sharing channel) physical layer signaling based on intermediate code is used.
Need to prove midamble allocation pattern the dedicated channel that subscriber equipment of the present invention is specific at all time slots except that time slot 0.Because the intermediate code of each time slot skew number is relevant with the maximum number of user that time slot can carry, when therefore the intermediate code skew is distributed for the user in the crack at a time, need to guarantee that the number of users that this time slot has carried limits smaller or equal to time slot maximum user.
Summary of the invention
The object of the present invention is to provide the specific intermediate code resource allocation methods of subscriber equipment in a kind of tdd systems, this distribution method can distribute the intermediate code of different distance to be offset to subscriber equipment according to the difference of user power under the prerequisite of as far as possible avoiding phase mutual interference between different user.
Whether method of the present invention is according to the difference of user power size, identical or close according to user power, determines to distribute the adjacent or non-conterminous Midamble sign indicating number skew of distance for the user.
For realizing purpose of the present invention, the invention provides the specific midamble allocation method of subscriber equipment in a kind of tdd systems, wherein, comprising:
A, relatively user's power;
B judges whether user's power is identical or close; In this way, then distribute adjacent intermediate code skew for the identical or close user of power; As not, then distribute non-conterminous intermediate code skew for the inequality and not close user of power;
Wherein, the difference power between the described close user of being meant is positioned at predefined thresholding.
Described method, wherein, described step a further comprises:
A1, the user's that more occupied intermediate code skew is carried the power and the user's to be accessed of intermediate code to be allocated skew power.
Described method, wherein, described step b further comprises:
B1 judges described occupied intermediate code is offset among the user of being carried whether have the power user identical or close with described user's to be accessed power;
B2, in this way, in the middle of adjacent idle of intermediate code skew then that described power with user to be accessed is identical or the user that is close partially sign indicating number move and distribute to described user to be accessed;
B3 as not, then will distribute to described user to be accessed with all non-conterminous idle intermediate code skew of described occupied intermediate code skew.
Described method, wherein, described step a1 further comprises from selected intermediate code skew and begins the user's that relatively all occupied intermediate codes skews are carried power and described user's to be accessed power.
Described method wherein, when having the identical or close user of power and described user's to be accessed power in judging the user that described occupied intermediate code skew is carried, further comprises:
Whether the intermediate code skew of judging the user that described power with user to be accessed is identical or be close exists the idle intermediate code skew that is adjacent;
In this way, then described user to be accessed is distributed in this adjacent idle intermediate code skew;
As not, then will be identical with described and user's to be accessed power or the user's that is close the immediate idle intermediate code of intermediate code offset distance be offset and distribute to described user to be accessed.
Described method wherein, when not having the identical or close user of power and described user's to be accessed power in judging the user that described occupied intermediate code skew is carried, further comprises:
Judge whether to exist and all non-conterminous idle intermediate code skew of described occupied intermediate code skew;
As not, the idle intermediate code adjacent with the intermediate code skew of the described user's to be accessed immediate CU of power is offset and distributes to described user to be accessed among the user of then will described occupied intermediate code skew being carried.
Described method wherein, when not having the identical or close user of the user's to be accessed that power and described intermediate code to be allocated be offset power in judging the user that described occupied intermediate code skew is carried, further comprises:
Judge whether to exist and all non-conterminous idle intermediate code skew of described occupied intermediate code skew;
In this way, then further judge in all non-conterminous idle intermediate code skew of described and occupied intermediate code skew whether exist the adjacent skew in its left and right sides to be idle idle intermediate code skew;
In this way, then the adjacent skew in this left and right sides is idle idle intermediate code skew and distributes to described user to be accessed.
Described method, wherein, described step a further comprises the step of the resource units RU number of comparison CU.
Described method, wherein, described step a further comprises the step of the sign indicating number resource of comparison CU, the code channel that takies or spreading factor.
Described method, wherein, described selected intermediate code skew is one in minimum intermediate code skew, the skew of maximum intermediate code or the skew of intermediate code at random.
The method according to this invention, the method of distributing can be the user power that begins to have carried more from minimum (or maximum or at random) Midamble sign indicating number skew and the size of user power to be allocated, if power is identical or approximate, then can distribute the skew adjacent to give the user with this Midamble sign indicating number skew; If the user identical or approximate with user power to be allocated then do not distribute with all non-conterminous idle skew of the Midamble sign indicating number offset distance that has distributed and gives the user; If it is all non-conterminous that itself and other user's Midamble sign indicating number skew is changed into, then the free time skew adjacent with the most approaching user's of its power Midamble skew should be distributed to the user.For the sake of simplicity, the size of user power can also be by its RU number, it is weighed factors such as the code channel that takies and spreading factor.Each time slot of user can independently carry out in the time of can distributing the skew of Midamble sign indicating number also can be interrelated, that is to say that we can be respectively the user at uplink and downlink timeslot and distribute the skew of Midamble sign indicating number, but also uplink and downlink timeslot only distributes a Midamble sign indicating number skew.Below we narrate the distribution method of Midamble skew, we can separately or be respectively applied for uplink and downlink timeslot.
Method of the present invention is at the user of different capacity, can be offset the phase mutual interference of avoiding between the user by distributing distance Midamble sign indicating number far away, and, can distribute adjacent Midamble sign indicating number skew for the user of equal-wattage, further improve the correctness of channel estimating thus.
By technique scheme as can be seen, the present invention is according to the difference on the user power, make the identical or close user Midamble sign indicating number skew of power adjacent according to certain principle, and the skew of the Midamble sign indicating number between the different capacity user is separated by, make the user of equal-wattage can utilize the Midamble resource fully, for the isolated condition that provides of different capacity user Midamble sign indicating number, avoided the phase mutual interference between the different capacity user, guaranteed that inter-user interference minimizes.
Description of drawings
Fig. 1 is the flow chart of the specific midamble allocation process of subscriber equipment in the tdd communication systems of the present invention.
Embodiment
The principle that the specific Midamble sign indicating number of subscriber equipment distributes is: for identical time slot, the skew of the Midamble sign indicating number of different user is different, during many code channels of same CU, can be it and distributes one or more Midamble sign indicating number skews; For different time-gap, the Midamble sign indicating number of each time slot distribute can be separate also can be interrelated, in other words, when the user takies a plurality of time slot simultaneously, each time slot for its distribute identical Midamble sign indicating number skew can be identical also can difference.
The skew that defines certain Midamble sign indicating number skew and be close to about it is called adjacent Midamble sign indicating number skew.The absolute value that defines the difference of two Midamble sign indicating numbers skew is called the distance of Midamble sign indicating number skew, and the distance of the big more then two Midamble sign indicating numbers skew of this value is far away more.Intercept because the Midamble sign indicating number is circulation, if therefore K Midamble skew arranged, we think that skew 1 and skew K also are adjacent skew.
The invention provides the specific midamble allocation method of subscriber equipment in a kind of tdd communication systems.Its core concept be according to the difference of power between the user for the user distributes the intermediate code skew, make that user's intermediate code skew of similar power is adjacent, user's intermediate code skew of different capacity is isolated, to avoid the phase mutual interference between different user.Because the intermediate code of uplink and downlink timeslot skew assigning process is comparatively approaching, so we merge into same process with it.Following specific implementation method can be used for the upstream or downstream time slot separately, uses the allocation result of upstream or downstream time slot to distribute an intermediate code skew as the user.Also can use simultaneously by uplink and downlink timeslot, for the user distributes two intermediate code skews at up-downlink direction.
Whether method of the present invention is according to the difference of user power size, identical or close according to user power, determines to distribute the adjacent or non-conterminous Midamble sign indicating number skew of distance for the user.Wherein, described power is close can be weighed by predefined thresholding, when two users' difference power thinks then that in this thresholding power is close.The method according to this invention, the principle of distributing can be the user power that begins to have carried more from minimum (or maximum or at random) Midamble sign indicating number skew and the size of user power to be allocated, if power is identical or approximate, then can distribute the idle middle skew adjacent to give the user with this Midamble sign indicating number skew; If the user identical or approximate with user power to be allocated then do not distribute with all non-conterminous idle skew of the Midamble sign indicating number offset distance that has distributed and gives the user; If can't make itself and other user's Midamble sign indicating number skew all non-conterminous, then the free time skew adjacent with the most approaching user's of its power Midamble skew should be distributed to the user.Wherein, if there is not skew in the middle of be adjacent idle in or the user's that be close identical with user's to be accessed power intermediate code skew, then will be identical with described and user's to be accessed power or the user's that is close the immediate idle intermediate code of intermediate code offset distance be offset and distribute to described user to be allocated.
Be described in further detail below in conjunction with the enforcement of accompanying drawing technical scheme, what need before the description to further specify is: the interference that the measurement of user power can be by user side, the aspects such as sign indicating number resource of use are by calculating, measure, estimate or the like that mode obtain, herein for the sake of simplicity, we are with user RU (the Resource Unit that takies of crack at a time, a basic resource units among the TD) number is weighed user's power, the user that the RU number is identical or close, we think that its power is identical, and we think its power difference and the RU number differs bigger user.
With reference to Fig. 1, the concrete implementation step of one embodiment of the invention is as follows:
Step 101: input user power and all occupied skew carrying users' RU number (power);
Step 102:, search occupied intermediate code skew successively and carry user's RU number (power) from minimum (or maximum or at random) intermediate code skew;
Step 103: whether user's the RU number (power) of judging the occupied skew carrying that previous step traverses in rapid is close with the size of user's to be allocated RU number (power); In this way, execution in step 104 then; Otherwise, execution in step 105;
Step 104: judge whether the adjacent intermediate code skew in this occupied skew left side or right side is idle; In this way, execution in step 108 then; Otherwise, execution in step 105;
Step 105: judge whether that all occupied skews have all traveled through; In this way, execution in step 106 then; Otherwise, execution in step 102;
Step 106: judge whether to exist all idle free time of the adjacent skew in the left and right sides to be offset, in this way, then execution in step 108; Otherwise, execution in step 107;
Step 107: select and the most approaching shared skew of user of access user power;
Step 108: should be offset the free time and distribute to the user, and return allocation result.
We illustrate the detailed process of distributing the intermediate code skew to the user.
Suppose that certain time slot intermediate code skew 1,3,5 is respectively 4,5,6 CU by the RU number, the RU number that newly inserts the user is 1.At first find all busy intermediate code skews, compare the user's that it carried RU number (power) and newly insert the big or small of user RU number and keep off, therefore further search the idle intermediate code skew that whether exists the adjacent skew in the left and right sides all idle, find skew 7 to satisfy this condition, it is distributed to the user, and return allocation result.
Suppose that again it is 4,2,2 CU that certain time slot intermediate code skew 2,4,5 distributes by the RU number, the RU number that newly inserts the user is 2.At first find all busy intermediate codes to be offset, relatively its user's of carrying RU number (power) and the newly size of access user's RU number, it is identical with the RU number (power) that is offset the user of carrying on 4,5 newly to insert the user; Further judge this two skews left side (or right) is adjacent whether have idle skew, but therefore allocation offsets 6 is given new access user, and return allocation result.
Method of the present invention is after distributing channelization code resource for the user, distributes the Midamble sign indicating number skew of a special use again for the user.Method of the present invention is a principle according to reducing the different capacity inter-user interference when distributing the skew of Midamble sign indicating number, make the Midamble sign indicating number skew of power same subscriber adjacent, and different capacity user's Midamble sign indicating number offset distance is far away, thereby the exit window when reducing channel estimating leaks.By method of the present invention, can weaken influencing each other between the different capacity user to a certain extent, improve the correctness of channel estimating.
The present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (10)
1. the specific midamble allocation method of subscriber equipment in the tdd systems is characterized in that, comprising:
A, relatively user's power;
B judges whether user's power is identical or close; In this way, then distribute adjacent intermediate code skew for the identical or close user of power; As not, then distribute non-conterminous intermediate code skew for the inequality and not close user of power;
Wherein, the difference power between the described close user of being meant is positioned at predefined thresholding.
2. method according to claim 1 is characterized in that, described step a further comprises:
A1, the user's that more occupied intermediate code skew is carried the power and the user's to be accessed of intermediate code to be allocated skew power.
3. method according to claim 2 is characterized in that, described step b further comprises:
B1 judges described occupied intermediate code is offset among the user of being carried whether have the power user identical or close with described user's to be accessed power;
B2, in this way, described user to be accessed is distributed in the adjacent idle intermediate code skew of intermediate code skew then that described power with user to be accessed is identical or the user that is close;
B3 as not, then will distribute to described user to be accessed with all non-conterminous idle intermediate code skew of described occupied intermediate code skew.
4. method according to claim 3 is characterized in that, described step a1 further comprises from selected intermediate code skew and begins the user's that relatively all occupied intermediate codes skews are carried power and described user's to be accessed power.
5. method according to claim 3 is characterized in that, when having the identical or close user of power and described user's to be accessed power in judging the user that described occupied intermediate code skew is carried, further comprises:
Whether the intermediate code skew of judging the user that described power with user to be accessed is identical or be close exists the idle intermediate code skew that is adjacent;
In this way, then described user to be accessed is distributed in this adjacent idle intermediate code skew;
As not, then will be identical with described and user's to be accessed power or the user's that is close the immediate idle intermediate code of intermediate code offset distance be offset and distribute to described user to be accessed.
6. method according to claim 3 is characterized in that, when not having the identical or close user of power and described user's to be accessed power in judging the user that described occupied intermediate code skew is carried, further comprises:
Judge whether to exist and all non-conterminous idle intermediate code skew of described occupied intermediate code skew;
As not, the idle intermediate code adjacent with the intermediate code skew of the described user's to be accessed immediate CU of power is offset and distributes to described user to be accessed among the user of then will described occupied intermediate code skew being carried.
7. method according to claim 3, it is characterized in that, when in judging the user that described occupied intermediate code skew is carried, not having the identical or close user of the user's to be accessed that power and described intermediate code to be allocated be offset power, further comprise:
Judge whether to exist and all non-conterminous idle intermediate code skew of described occupied intermediate code skew;
In this way, then further judge in all non-conterminous idle intermediate code skew of described and occupied intermediate code skew whether exist the adjacent skew in its left and right sides to be idle idle intermediate code skew;
In this way, then the adjacent skew in this left and right sides is idle idle intermediate code skew and distributes to described user to be accessed.
8. according to the described method of arbitrary claim among the claim 1-7, it is characterized in that described step a further comprises the step of the resource units RU number of comparison CU.
9. according to the described method of arbitrary claim among the claim 1-7, it is characterized in that described step a further comprises the step of the sign indicating number resource of comparison CU, the code channel that takies or spreading factor.
10. method according to claim 4 is characterized in that, described selected intermediate code skew is one in minimum intermediate code skew, the skew of maximum intermediate code or the skew of intermediate code at random.
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| CN101741419B (en) * | 2008-11-10 | 2013-02-27 | 中兴通讯股份有限公司 | Channel estimation method and device of TD-SCDMA terminal |
| US20110319045A1 (en) * | 2010-05-05 | 2011-12-29 | Wenjun Li | Linear interference cancellation receiver |
| CN102387586B (en) * | 2010-08-30 | 2014-07-09 | 普天信息技术研究院有限公司 | TD-SCDMA (Time Division-Synchronous Code Division Multiple Access) system-based resource allocation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1327312A (en) * | 2000-06-07 | 2001-12-19 | 华为技术有限公司 | Forming method of training sequence in channel evaluation |
| EP1233545A1 (en) * | 2000-09-01 | 2002-08-21 | Matsushita Electric Industrial Co., Ltd. | Base station apparatus and communication method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1327312A (en) * | 2000-06-07 | 2001-12-19 | 华为技术有限公司 | Forming method of training sequence in channel evaluation |
| EP1233545A1 (en) * | 2000-09-01 | 2002-08-21 | Matsushita Electric Industrial Co., Ltd. | Base station apparatus and communication method |
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