CN1852068B - Walsh code distribution method - Google Patents
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Abstract
This invention discloses a distributing method for Walsh codes characterizing in including the following steps: a, determining the released Walsh codes in advance based on the delay judgment before finishing the burst of the service channel and releasing them in advance, b, distributing the Walsh codes based on the current idle Walsh codes and those released in step a to increase the time usability of code resources.
Description
Technical field
The present invention relates to the spread spectrum in the mobile communication system, the distribution method of particularly a kind of Walsh (Walsh) sign indicating number.
Background technology
The Walsh sign indicating number often is used in the mobile communication system, such as at code division multiple access (CDMA, CodeDivision Multiple Access) in the modulation of system forward channel, the Walsh sign indicating number is used for spread spectrum, simultaneously also be used to distinguish each forward channel, described forward direction is meant the direction of radio signal from the network side to the travelling carriage.In the radio signal carrier frequency that network side sends, Walsh code corresponding to each forward channel must be mutually orthogonal, and be correct to guarantee decoding, therefore, needs network side that carrier frequency Walsh code is distributed and manage.General each carrier frequency all has a Walsh code tree, and Fig. 1 is a Walsh code tree schematic diagram, among Fig. 1, the Walsh sign indicating number decomposes 128 nodes on 128 rank from 1 node on 1 rank, each father node is divided into two child nodes, and wherein quadrature between the same order node is non-orthogonal between father node and its child node.Also there is the Walsh sign indicating number to decompose the Walsh code tree of 64 nodes on 64 rank from 1 node on 1 rank in the practical application.Described code tree is the logic code tree herein, mark the Walsh node be the idle of Walsh code or take the state of grade, be used for the distribution of Walsh code.
Usually, forward channel in the cdma system comprises shared channel and Traffic Channel, wherein Traffic Channel is divided into primary channel (FCH, Fundamental Channel) and complement channel (SCH, SupplementalChannel), described SCH is also different according to the exponent number of the shared Walsh sign indicating number of speed difference.The SCH speed more exponent number of the Walsh code of high request is more low, because its child node all will take when taking a Walsh code, the Walsh code that therefore takies is also more many, on the contrary, the exponent number of Walsh code is more low, and the Walsh code that it comprises is more many, and the SCH speed that can support is more high.Generally speaking, the exponent number of Walsh code is more low, and the Walsh code is more big, otherwise the exponent number of Walsh code is more high, and the Walsh code is more little.Usually, the SCH speed that the Walsh sign indicating number on one 64 rank can be supported is 9.6Kbps, and the SCH speed that the Walsh sign indicating number on 32 rank can be supported is 9.6Kbps * 2=19.2Kbps ... the SCH speed that the Walsh sign indicating number on 4 rank can be supported is 9.6Kbps * 16=153.6Kbps, and the rest may be inferred.
The Walsh sign indicating number is the main logical resource of carrier frequency, if there are not enough Walsh sign indicating numbers, can not distribute high speed SCH, if there is not idle Walsh sign indicating number, call business can not insert, especially during transmitting data service, distribute high speed SCH, need take a large amount of Walsh sign indicating numbers, so the Walsh sign indicating number often becomes resource bottleneck, the fine or not size that directly influences the carrier frequency capacity of management of Walsh sign indicating number and allocation algorithm.
The process that the Walsh code distributes in the prior art is: when network side is prepared to distribute SCH, according to the Walsh code distribution Walsh code of current free time.That is: when network side is prepared to distribute SCH, at first inquire about the SCH speed that the not busy Walsh code of code tree hollow can be supported, and distribute the Walsh code.
Specifically: when network side prepares to distribute SCH to certain user, at first inquire about carrier frequency Walsh code tree, look for idle Walsh sign indicating number, the SCH speed that decision can be supported according to the size of idle Walsh sign indicating number, described speed is the flank speed that the Walsh sign indicating number of current free time can be supported, network side is determined after the flank speed distribute the Walsh sign indicating number to SCH in being no more than the scope of described flank speed, so the speed of actual allocated can be smaller or equal to described flank speed again according to other conditions.After distributing the Walsh sign indicating number, the Walsh sign indicating number that mark has just distributed in the Walsh code tree is a seizure condition immediately.Pass through the SCH assignment messages after distributing the Walsh sign indicating number, the Walsh sign indicating number that the notice travelling carriage distributes to Burst.
Fig. 2 distributes the operating position schematic diagram of Walsh sign indicating number behind the SCH for network side, as shown in Figure 2, the Walsh sign indicating number is occupied after network side distributes SCH, but after distributing SCH, network side needs through a SCH start delay time, just have the burst (Burst) of SCH, promptly have the data burst of SCH, network side and travelling carriage interaction data in the Burst duration of SCH (Duration).When finishing, the Burst of this SCH discharges corresponding Walsh sign indicating number, the process of the concrete Walsh of release sign indicating number comprises: network side is removed institute and is discharged the Walsh sign indicating number take mark in the Walsh code tree, and the while travelling carriage stops the use of this section Walsh sign indicating number automatically when Burst finishes.After this, this section Walsh sign indicating number can be used by other user.
Can find out among Fig. 2, the period that the Walsh code really is used is SCH Burst Duration, distribute in the SCH start delay time of SCH beginning to start to SCH from network side, the described Walsh code that is assigned with really is not used, be that the Walsh code accounts for and do not use, but in the carrier frequency Walsh of network side code tree, be marked as seizure condition, in SCH Burst Duration, do not distribute to other user to guarantee the Walsh code that is assigned with.
In a system, the described SCH start delay time is provided with in advance by network side, such as being set to 10 frames etc.
The shortcoming of prior art is: the Walsh sign indicating number really was not used in the SCH start delay time, caused the time availability of Walsh sign indicating number not high.Such as: when Duration is 32 frames, SCH start delay time when being 10 frames, Walsh sign indicating number time availability=Duration/ (Duration+SCH start delay time)=32/ (32+10)=76%.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of Walsh code distribution method, can improve the time availability of yard resource.
Technical scheme of the present invention is achieved in that
A kind of Walsh code distributing method, the method includes the steps of:
A, Traffic Channel SCH burst Burst finishes to continue judgement before the prerequisite, when network side is prepared to distribute SCH, the Walsh code that inquiry will discharge in the SCH start delay time in the carrier frequency, the Walsh Walsh code that the Walsh code that inquires is defined as discharging in advance, and discharge in advance;
B, distribute the Walsh sign indicating number according to the Walsh sign indicating number that discharges in advance among current idle Walsh sign indicating number and the step a.
This method further comprises:
The relation of the Walsh code that discharges in advance described in the Walsh code that distributes described in the detecting step b and the step a if exist overlappingly, then when the Burst of the SCH of the described Walsh code correspondence that discharges in advance of step a finishes, does not discharge the Walsh code of lap; If there is no overlapping, then when finishing, the Burst of the described in advance SCH of the Walsh code correspondence of release of step a discharges its Walsh code.
If describedly exist overlapping in overlapping to be: overlapping fully.
If describedly exist overlapping in overlapping to be: overlap.
Described overlap for: the Walsh code that distributes described in the step b bigger than the Walsh code that discharges in advance described in the step a; Or the Walsh code that distributes described in the step b is littler than the Walsh code that discharges in advance described in the step a.
A kind of Walsh Walsh code distributing method comprises following steps:
A, before finishing prerequisite, Traffic Channel SCH burst Burst continues judgement, the Walsh code that part of Walsh code that will discharge behind the reduction of speed of the SCH that judgement is continued for reduction of speed for the Walsh code of the SCH that do not continue and judgement is defined as discharging in advance, and discharge in advance; Wherein, the continuity judgement time is in advance arranged in advance by network side, and the time span that shifts to an earlier date is not more than the SCH start delay time;
B, distribute the Walsh sign indicating number according to the Walsh sign indicating number that discharges in advance among current idle Walsh sign indicating number and the step a.
This method comprises: the prediction code tree is set, and regularly upgrades the prediction code tree;
Correspondingly, described step b is specially: when network side is prepared to distribute SCH, distribute the Walsh code according to the not busy Walsh code of prediction code tree hollow.
The prediction code tree is upgraded in described timing:
Be seizure condition at the Walsh code that distributes the SCH tense marker to be assigned with, SCH is judged as not continue or remove during the reduction of speed continuity and is about to the Walsh code that discharges takies mark in the prediction code tree before the Burst of SCH finishes.
This method further comprises: current code tree is set, and regularly upgrades current code tree.
Current code tree is upgraded in described timing: starting Walsh code corresponding to tense marker at SCH Burst is seizure condition, removes this Walsh code and take mark when SCH Burst finishes in current code tree.
Core of the present invention is according to the SCH continuity judgement of carrying out in advance, determines the Walsh sign indicating number of release in advance, and discharges the Walsh sign indicating number in advance; Walsh sign indicating number according to the current idle Walsh sign indicating number of current free time and release in advance distributes the Walsh sign indicating number again.The present invention has following beneficial effect:
1) by adopting SCH Walsh sign indicating number prediction apportion design, promptly predict the Walsh sign indicating number that in the SCH start delay time, is about to release in advance, and it is distributed, make that the Walsh sign indicating number that distributes when distributing SCH is a Walsh sign indicating number just in use, reduce the free time of Walsh sign indicating number thus, improve the time availability of sign indicating number resource.
2) therefore the present invention can improve the data throughout of single carrier frequency because the Walsh sign indicating number resource of carrier frequency is fully used in time, correspondingly also can improve each user's data throughput in the carrier frequency.
Description of drawings
Fig. 1 is a Walsh code tree schematic diagram;
Fig. 2 is the operating position schematic diagram of Walsh code in the prior art;
Fig. 3 is Walsh code assigning process schematic diagram in the embodiment of the invention 1;
Fig. 4 is the operating position schematic diagram of Walsh sign indicating number in the embodiment of the invention 1;
Fig. 5 is Walsh code assigning process schematic diagram in the embodiment of the invention 2.
Embodiment
Walsh code distributing method of the present invention is according to the SCH continuity judgement of carrying out in advance, determines the Walsh sign indicating number of release in advance, and discharges the Walsh sign indicating number in advance; Walsh sign indicating number according to the current idle Walsh sign indicating number of current free time and release in advance distributes the Walsh sign indicating number again.Determine that wherein the Walsh code that discharges in advance can be: when network side is prepared to distribute SCH, the Walsh code that the Walsh code that is about in the carrier frequency discharge in the SCH start delay time is defined as discharging in advance; Also can be: after carrying out in advance SCH continuity judgement, the Walsh code that part of Walsh code that will discharge behind the reduction of speed of the SCH that judgement is continued for reduction of speed for the Walsh code of the SCH that do not continue and judgement is defined as discharging in advance.
The SCH of described reduction of speed continuity refers to be continuity through judgement after the SCH continuity judgement, and the speed SCH that will reduce, and behind the SCH of SCH judgement for the reduction of speed continuity, will discharge a part of Walsh code when the old Burst end of this SCH.Behind the SCH of SCH judgement for the reduction of speed continuity, which part Walsh network side can adjudicate is the Walsh sign indicating number that is about to release behind the reduction of speed.
Owing to need which Walsh code of look-ahead to be about to discharge in the distribution method of the present invention, so the distribution method among the present invention also can be called the Walsh code distributing method based on prediction.
Following with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is described in more detail.
Embodiment 1:
Determine in the present embodiment that the Walsh code that discharges in advance is: when network side is prepared to distribute SCH, the Walsh code that the Walsh code that is about in the carrier frequency discharge in the SCH start delay time is defined as discharging in advance.
Fig. 3 is a Walsh sign indicating number assigning process schematic diagram in the present embodiment, and process shown in Figure 3 comprises following steps:
Step 301: network side prepares to distribute SCH, and the SCH that will discharge in the SCH start delay time in the inquiry carrier frequency discharges in advance to its Walsh code.
The SCH that network side is prepared to distribute is called new SCH herein, and the SCH that is about to discharge is called former SCH.
The SCH that will discharge in the SCH start delay time described in the step 301 refers to: through the continuity judgement that finishes at SCH Burst to carry out for the previous period, adjudicate to not continuing, and be about to the SCH that discharges in the SCH start delay time.
Specifically: network side finishes for the previous period at each Burst of SCH, carries out in advance SCH continuity judgement, if certain SCH judgement is continuity, distributes new Burst for the SCH of continuity then can for judgement; For the SCH of judgement for not continuing, no longer distribute new Burst to it, and when former Burst finishes, discharge original Walsh code.Wherein, for the SCH of judgement for not continuing, will discharge when its SCH Burst finishes, the Walsh code that SCH Burst takies is the Walsh code of judgement for being about to discharge after SCH continuity judgement, and will really be released when SCH Burst finishes; Continue for reduction of speed for judgement among the SCH of continuity for judgement, discharge a part of Walsh code in the time of will finishing at the old Burst of its SCH, this a part of Walsh code is adjudicated the Walsh code that discharges into being about to after the SCH judgement is for the reduction of speed judgement, and will really be released when the old Burst end of SCH.If the Walsh code be judged as be about to be discharged between really being released during this period of time in, network side is prepared to distribute new SCH, and inquires about in carrier frequency, then can inquire and be about to the SCH that discharges in the SCH start delay time.The SCH that is about to discharge in the SCH start delay time can be one or more.
In the step 30 1, if network side inquires the SCH that will discharge in the SCH start delay time, discharge in advance immediately its Walsh code, namely the Walsh code is discharged in advance.Describedly be released in advance the release of network side in the code tree logic, be its Walsh code to be recorded as be about to the Walsh code that discharges, and discharge in advance immediately that this moment, described Walsh code was also used by original SCH, discharged the result and did not notify travelling carriage.
The time that SCH continues the time ratio SCH Burst end of judgement will shift to an earlier date a period of time, and the length of described a period of time can arrange arbitrarily.In the step 301, the continuity of the SCH judgement time is in advance arranged in advance by network side.
In the step 301, for when network side prepare to distribute SCH, inquire continue in advance judgement the time judgement be the Walsh code of the former SCH that do not continue and after new SCH starts, just can discharge, do not discharge in advance.
Step 302: network side distributes the Walsh sign indicating number according to current idle Walsh sign indicating number and the pre-Walsh sign indicating number that discharges.
In the step 302, network side is at first determined the SCH speed that the pre-Walsh code that discharges can be supported jointly in current idle Walsh code and the step 301, i.e. flank speed, and the Walsh code of reallocating, the speed of actual allocated can be smaller or equal to described flank speed.
After distributing the Walsh code, the relation of the Walsh code that can detect new distribution Walsh code and be about to discharge, if exist overlapping, then resume overlapping part in the Walsh code that discharges in advance in the step 301, the Walsh code of lap is owing to used by new SCH in other words, when former Burst finishes, no longer discharge, and in the Walsh code tree, still be labeled as seizure condition; If not overlapping, then when former Burst finishes, discharge the Walsh code that former Burst takies, and remove immediately it and in the Walsh code tree, take mark, after this, this section Walsh code can be used by other user.
The new Walsh of distribution sign indicating number can comprise with the overlapping relation of the Walsh sign indicating number that is about to discharge: overlapping fully or overlap, wherein overlap and comprise: newly to distribute the Walsh sign indicating number than the Walsh sign indicating number that is about to discharge big or newly distribute the Walsh sign indicating number than situations such as the Walsh sign indicating number that is about to discharge are little.Complete when overlapping when new distribution Walsh sign indicating number and the Walsh sign indicating number that is about to discharge, when former Burst finishes, no longer discharge, in the Walsh code tree, all resume; When new distribution Walsh sign indicating number is bigger than the Walsh sign indicating number that is about to discharge, when former Burst finishes, no longer discharge, in the Walsh code tree, all resume; When new distribution Walsh sign indicating number than the Walsh sign indicating number that is about to discharge hour, when former Burst finished, only discharging unnecessary part was non-overlapping portions, overlapping part is resumed in the Walsh code tree.In described the overlapping, newly distribute the Walsh sign indicating number to be meant greatly that than the Walsh sign indicating number that is about to discharge newly assigned Walsh sign indicating number has covered the Walsh sign indicating number that will soon discharge in the Walsh code tree, and covered other Walsh sign indicating numbers; The new Walsh of distribution sign indicating number is meant for a short time that than the Walsh sign indicating number that is about to discharge the Walsh sign indicating number that is about to discharge has covered newly assigned Walsh sign indicating number in the Walsh code tree, and has covered other Walsh sign indicating numbers.
Distribute the Walsh code relevant with the speed of Burst in the step 302, when the speed of Burst was high, the Walsh code was big, and the exponent number that takies in the Walsh code tree is low; When the speed of Burst was hanged down, the Walsh code was little, the exponent number height that takies in the Walsh code tree.
Fig. 4 is the operating position schematic diagram of Walsh sign indicating number in the present embodiment, and as shown in Figure 4, the operating position of Walsh sign indicating number is:
The Walsh sign indicating number operating position of user A is specially: network side distributes SCH, and user A takies Walsh sign indicating number X; SCH Burst begins back Walsh sign indicating number X and really is used; Network side finishes for the previous period at the Burst of the SCH of user A, continues judgement, and SCH adjudicates to not continuing, and new Burst does not reallocate; The Burst of user A will discharge its Walsh sign indicating number X when its Duration finishes;
The Walsh sign indicating number operating position of user B, be specially: the SCH of user A be discharged into from judgement real release during this period of time in, user B applies for SCH, there is not idle Walsh sign indicating number, but network side predicts Walsh sign indicating number X will be discharged in the SCH start delay time, and discharge Walsh sign indicating number X immediately in advance, distribute Walsh sign indicating number X for user B; The Burst of user A is real its Walsh sign indicating number X that discharges when its Duration finishes, and Walsh sign indicating number X is really used by user B afterwards; The Burst of user B will really discharge its Walsh sign indicating number X when its Duration finishes;
As can be seen from Figure 4: Walsh code X is being used by user B after being used by user A at once, and the Walsh code is both by user A and simultaneously overlapping use of B, and the Walsh code does not have idle condition yet between being used by user A and being used by user B, fully is utilized.Therefore Walsh code X user B take that its time utilization rate is 100% in the period, specifically: Walsh code X after distributing to user B, the part in the SCH start delay time, the part 401 that namely marks with oblique line among Fig. 4 is really used by user A; Part in the SCH Burst Duration, the part 402 that namely marks with vertical line among Fig. 4 is really used by user B.
Embodiment 2:
In the present embodiment, discharging the Walsh sign indicating number in advance is: after carrying out SCH continuity judgement in advance, the Walsh sign indicating number that the Walsh sign indicating number that judgement will be discharged after for the Walsh sign indicating number of the SCH that do not continue and the reduction of speed of judgement for the SCH of reduction of speed continuity is defined as discharging in advance, and release in advance immediately.Present embodiment can be by being provided with the prediction code tree, and distribute the Walsh sign indicating number to realize according to the not busy Walsh sign indicating number of prediction code tree hollow.
Fig. 5 is a Walsh sign indicating number assigning process schematic diagram in the present embodiment, and process shown in Figure 5 comprises following steps:
Step 501: network side is provided with the prediction code tree in advance, and regularly upgrades the prediction code tree.
The code tree of prediction described in the step 501 is used for free time and the seizure condition of mark Walsh code after a period of time, wherein comprises time point information, in order to represent free time and the seizure condition of prediction code tree on the following different time points.
Regularly upgrading the prediction code tree described in the step 501 is: upgrading the prediction code tree after distributing the Walsh code to SCH, is seizure condition with the Walsh code labeling that distributes in the prediction code tree namely; When closing to an end, the Burst of SCH continues judgement and judgement for not continuing or reduction of speed when continuing, remove the Walsh code that is about to release, upgrade the prediction code tree, the i.e. release judging Walsh code that will discharge after for Walsh code corresponding to the SCH Burst that do not continue and the reduction of speed of judgement for the SCH of reduction of speed continuity in advance, and remove it and in predicting code tree, take mark.The described result who discharges does not in advance notify travelling carriage.
Usually network side also can be provided with current code tree, and regularly upgrades current code tree.Described current code tree is used for current actual free time of mark Walsh code and seizure condition.Current code tree is upgraded in described timing: upgrade current code tree when SCHBurst starts, namely the Walsh code labeling that the Burst of SCH is corresponding is seizure condition in current code tree; When the Burst of SCH finishes, remove it and in current code tree, take mark, will discharge simultaneously result notification to travelling carriage.
Step 502: network side prepares to distribute SCH, distributes the Walsh code according to the not busy Walsh code of prediction code tree hollow.
In the step 502, network side is at first inquired about the SCH speed that the not busy Walsh code of prediction code tree hollow can be supported, i.e. flank speed, and reallocation Walsh code, the speed of actual allocated can be smaller or equal to described flank speed.
SCH described in the step 501 continues the time that the Burst of the time ratio SCH of judgement finishes and will shift to an earlier date a period of time, and the length of described a period of time can be provided with arbitrarily under the situation that is not more than the SCH start delay time.Be 10 frames such as the SCH start delay time, then SCH can than Burst concluding time of SCH in advance 10 frames continue judgement.Why require to continue in advance the time of judgement otherwise greater than the SCH start delay time, be because after the Walsh code that the acceptance of the bid of prediction code tree is designated as idle condition is being assigned with, need to when SCH Burst starts, guarantee really to be discharged.In the present embodiment, the continuity of the SCH judgement time in advance is provided with in advance by network side.
Except in cdma system, the present invention can also be applicable in other GSMs.
The above is preferred embodiment of the present invention only, is not to be used to limit the scope of application of the present invention.
Claims (10)
1. Walsh Walsh code distributing method is characterized in that the method includes the steps of:
A, Traffic Channel SCH burst Burst finishes to continue judgement before the prerequisite, when network side is prepared to distribute SCH, the Walsh code that inquiry will discharge in the SCH start delay time in the carrier frequency, the Walsh code that the Walsh code that inquires is defined as discharging in advance, and discharge in advance;
B, distribute the Walsh sign indicating number according to the Walsh sign indicating number that discharges in advance among current idle Walsh sign indicating number and the step a.
2. method according to claim 1 is characterized in that, this method further comprises:
The relation of the Walsh code that discharges in advance described in the Walsh code that distributes described in the detecting step b and the step a if exist overlappingly, then when the Burst of the SCH of the described Walsh code correspondence that discharges in advance of step a finishes, does not discharge the Walsh code of lap; If there is no overlapping, then when finishing, the Burst of the described in advance SCH of the Walsh code correspondence of release of step a discharges its Walsh code.
3. method according to claim 2 is characterized in that, if describedly exist overlapping in overlapping to be: overlapping fully.
4. method according to claim 2 is characterized in that, if describedly exist overlapping in overlapping to be: overlap.
5. method according to claim 4 is characterized in that, described overlap for: the Walsh code that distributes described in the step b bigger than the Walsh code that discharges in advance described in the step a; Or the Walsh code that distributes described in the step b is littler than the Walsh code that discharges in advance described in the step a.
6. Walsh Walsh code distributing method is characterized in that the method includes the steps of:
A, before finishing prerequisite, Traffic Channel SCH burst Burst continues judgement, the Walsh code that part of Walsh code that will discharge behind the reduction of speed of the SCH that judgement is continued for reduction of speed for the Walsh code of the SCH that do not continue and judgement is defined as discharging in advance, and discharge in advance; Wherein, the continuity judgement time is in advance arranged in advance by network side, and the time span that shifts to an earlier date is not more than the SCH start delay time;
B, distribute the Walsh sign indicating number according to the Walsh sign indicating number that discharges in advance among current idle Walsh sign indicating number and the step a.
7. method according to claim 6 is characterized in that, this method comprises: the prediction code tree is set, and regularly upgrades the prediction code tree;
Correspondingly, described step b is specially: when network side is prepared to distribute SCH, distribute the Walsh code according to the not busy Walsh code of prediction code tree hollow.
8. method according to claim 7 is characterized in that, described timing is upgraded the prediction code tree and is:
Be seizure condition at the Walsh code that distributes the SCH tense marker to be assigned with, SCH is judged as not continue or remove during the reduction of speed continuity and is about to the Walsh code that discharges takies mark in the prediction code tree before the Burst of SCH finishes.
9. method according to claim 7 is characterized in that, this method further comprises: current code tree is set, and regularly upgrades current code tree.
10. method according to claim 9, it is characterized in that, current code tree is upgraded in described timing: the Walsh sign indicating number that starts the tense marker correspondence at SCH Burst is a seizure condition, removes this Walsh sign indicating number and take mark when SCH Burst finishes in current code tree.
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| CN2005101266855A CN1852068B (en) | 2005-12-05 | 2005-12-05 | Walsh code distribution method |
| PCT/CN2006/002678 WO2007065334A1 (en) | 2005-12-05 | 2006-10-12 | A walsh codes assigning method |
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| CN2005101266855A CN1852068B (en) | 2005-12-05 | 2005-12-05 | Walsh code distribution method |
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| CN1356813A (en) * | 2000-12-01 | 2002-07-03 | 朗迅科技公司 | Auxiliary channel sharing algorithm |
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| US6317413B1 (en) * | 1998-05-18 | 2001-11-13 | Nokia Mobile Phones Ltd. | Method and apparatus for assigning variable length walsh codes in a spread spectrum system |
| US6314107B1 (en) * | 1998-10-20 | 2001-11-06 | Qualcomm Incorporated | Method and apparatus for assigning spreading codes |
| US7539162B2 (en) * | 2001-12-24 | 2009-05-26 | Nortel Networks Limited | Walsh code management in a code division multiple access cellular wireless communication system |
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