CN100429876C - External ring power control method and system in CDMA system - Google Patents
External ring power control method and system in CDMA system Download PDFInfo
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- CN100429876C CN100429876C CNB2005100509741A CN200510050974A CN100429876C CN 100429876 C CN100429876 C CN 100429876C CN B2005100509741 A CNB2005100509741 A CN B2005100509741A CN 200510050974 A CN200510050974 A CN 200510050974A CN 100429876 C CN100429876 C CN 100429876C
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Abstract
The present invention provides an exterior ring power control method and a system in a code division multiple access system when various kinds of service are multiplexed on a same physical channel. The method comprises the following steps: exterior ring power control priorities of the service are defined according to the height of SIR target values required by the service, and the higher the SIR target value required by the service is, the higher the priority of the service is; each kind of the service generates each target SIR adjusting command according to received signal quality and a service quality target value received by the service; all of the received service target SIR adjusting commands are merged, and final target SIR adjusting commands are generated, wherein when no required target SIR upward adjusting commands but required target SIR downward adjusting commands are in the received service target SIR adjusting commands, the final target SIR adjusting commands are generated according to the defined priorities; the SIR target values are updated according to the final target SIR adjusting commands.
Description
Technical field
The present invention relates to the outer-loop power controlling method in a kind of code division multiple access (CDMA) system, particularly relate to multiplexing outer-loop power controlling method and the system on same physical channel time of multiple business in the cdma system.
Technical background
In cdma system, performances such as the capacity of system and covering depend on the interference that the user is suffered to a great extent, and wherein, power control techniques has become a kind of key technology of cdma communication system as a kind of effective means that reduces interchannel interference.
In cdma system, power control is divided into open Loop Power control and closed power control, and open Loop Power control is a kind of "ball-park" estimate to channel fading, the then effectively quick decline of tracking signal of closed power control.Closed power control comprises two parts again: inner loop power control and exterior ring power control.Inner loop power control instructs the transmitting power of regulating transmitting terminal to reach current goal signal to noise ratio (SIR) by a series of power adjustment, exterior ring power control is then followed the tracks of the variation of user moving speed and multipath fading environments by adjusting target signal to noise ratio (SIR), to guarantee that receiver obtains suitable performance index, as Block Error Rate (BLER) and frame error rate (FER).
In typical exterior ring power control algolithm, when the mass parameters such as FER/BLER of actual measurement are lower than the FER/BLER desired value, exterior ring power control will reduce the sir target value, reduce the transmitting power of transmitting terminal so that the actual measurement FER/BLER of receiving terminal converges on target FER/BLER by inner loop power control; Otherwise, when the mass parameters such as FER/BLER of actual measurement are higher than the FER/BLER desired value, exterior ring power control will increase the sir target value, improve the transmitting power of transmitting terminal so that the actual measurement FER/BLER of receiving terminal converges on target FER/BLER by inner loop power control.
Along with the fast development of mobile communication, people require also more and more higher to the quality of mobile communication and the type of service that provides thereof, and the proposition of 3G (Third Generation) Moblie and development have met people's this demand just.In 3-G (Generation Three mobile communication system) (3G), multiple business can be simultaneously multiplexing on same physical channel, thereby be multimedia service, application such as use provides strong support in the time of voice and background data business, therefore, the multi-business multiplexing in the same physical connection is a characteristic feature of 3G system.
In cdma system, inner loop power control is based on that the sir measurement of a certain physical channel controls, and is multiplexing on same physical channel the time when multiple business, only has a public inner loop power control loop.Therefore, in order to guarantee all professional required operation quality requirement (QoS), should select the peak of required target SIR in all business, as the target SIR of exterior ring power control loop generation.Patents such as patent No. WO9953701 and US6173162, publication number US2003/0036403 and US2004/0082301 are all discussed this technology, wherein the technology that relates to of two pieces of patents of US2003/0036403 and US2004/0082301 is ripe and perfect more, to analyse in depth the technical scheme that these two pieces of patents propose below, to illustrate the deficiencies in the prior art.
Fig. 1 is the flow chart of patent US 2003/0036403 technical scheme.The core concept of this patent is described below: at a plurality of transmission channels, when adopting multiple transformat to be mapped on the same physical channel, every kind of transformat of each transmission channel has independently exterior ring power control loop and local SNIR (signal-to-noise-plus-interferenceratio) desired value separately.According to received signal quality, each external power control loop adjustment local SNIR desired value separately (when transmission block receives mistake, adjusts upward local SNIR desired value; When transmission block correctly receives, if local SNIR desired value equals current public SNIR desired value, adjust downwards this this locality SNIR desired value, otherwise keep this this locality SNIR desired value constant), select the public SNIR desired value output of conduct maximum in all local SNIR desired values then.Technical scheme based on this patent, can prevent the control situation of crossing that the low professional local SNIR desired value of those required SNIR desired values continues to reduce, but still have following topic: 1) for the lower business of those required SNIR desired values, there is the control trend of crossing that is higher than actual required SNIR desired value in its local SNIR desired value; 2) when the highest business of required SNIR desired value is in quiet period, required public SNIR desired value changes because of the transformat variation can cause at this moment, if this moment, required public SNIR desired value was lower than previous public SNIR desired value, because the required SNIR desired value the most local SNIR of high business remains unchanged and the public SNIR desired value that causes exporting can't reduce, thereby increased system interference, reduced power system capacity; If this moment, required public SNIR desired value was higher than previous public SNIR desired value, lower owing to other professional local SNIR desired values, can not rise to actual required public SNIR desired value rapidly and cause the communication quality deterioration, can't satisfy user's qos requirement.
Fig. 2 is the enforcement block diagram of patent US 2004/0082301 technical scheme.The core concept of this patent is: multiplexing on same physical channel the time in multiple business, and dynamically select a kind of business public sir target value to be adjusted as the benchmark of exterior ring power control and according to this professional received signal quality.The criterion of its Dynamic Selection business is, if exist communication quality can not satisfy the business of its qos requirement, then selects the business of practical communication quality and required QoS difference maximum in these business; If all professional practical communication quality all are better than its qos requirement, then select business near its qos requirement.Technical scheme based on this patent, avoided the mistake control problem of the local sir target value of miscellaneous service, but still have following deficiency: 1) whether Ye Wu communication quality satisfies its QoS, need just can obtain more believable result long measuring period, this just causes a kind of business of Dynamic Selection to be difficult to realize that its outer ring power control performance also is difficult to be guaranteed as the benchmark of exterior ring power control; 2) activating and mourning in silence when changing between two states when some business, variation greatly takes place because of the transformat variation can cause required public sir target value, technical scheme based on this patent, the variation of actual required public sir target value can't be followed the tracks of in this case fast, thereby good outer ring power control performance can't be obtained.
Summary of the invention
Purpose of the present invention is exactly at above-mentioned the deficiencies in the prior art, proposes a kind of multiplexing outer-loop power controlling method on same physical channel time of cdma system multiple business that is used for, to improve its outer ring power control performance.
Before describing technical scheme of the present invention, be defined as follows some symbolic variables earlier.
According to a first aspect of the invention, provide a kind of in cdma system the multiplexing outer-loop power controlling method on same physical channel time of multiple business, may further comprise the steps:
First step (1), multiplexing on same physical channel the time in multiple business, just define the priority of the exterior ring power control of miscellaneous service according to the required sir target value of business, professional required sir target value requires high more, and its priority is high more;
Second step (2), for every kind of business, received signal quality and quality of service desired value according to every kind of received business, produce target SIR adjustment order separately, described target SIR adjustment order comprises that the requirement target SIR adjusts order downwards, requires target SIR to adjust upward the order that remains unchanged of order and target SIR;
Third step (3), all received professional target SIR adjustment orders are merged processing, produce final objective SIR and adjust order, wherein, when having the requirement target SIR when not requiring target SIR to adjust upward order in the target SIR adjustment order of received business and adjust order downwards, produce final objective SIR according to defined priority and adjust order;
The 4th step (4) is adjusted order according to final objective SIR, and the sir target value is upgraded.
Described second step (2) further comprises following substep:
First determining step (201) for every kind of type of service i, judges according to the signal quality of received type of service i whether transmission block correctly receives, if then carry out the first depreciation step (202); If not, then change over to and carry out the first increment step (206), wherein represent i class type of service with type of service i;
The first depreciation step (202), the intermediate variable (Addition_SIR (i)) of type of service i is deducted Bler_target (i) * Upstep, wherein, the target Block Error Rate (BLER) of BLER_target (i) expression type of service i, Upstep represents the step-length that adjusts upward of target SIR, and Bler_target (i) * Upstep represents the product of Bler_target (i) and Upstep;
Second determining step (203), whether the intermediate variable (Addition_SIR (i)) of judging type of service i is less than first thresholding-Downstep, Downstep is the downward adjustment step-length of target SIR,-Downstep is the negative value of the downward adjustment step-length of target SIR, if then carry out first and produce step (204); Carry out the second generation step (205) otherwise change over to;
First produces step (204), produces target SIR and adjusts order downwards, changes over to carry out the first output step (209);
Second produces step (205), produces the target SIR order that remains unchanged; Change over to and carry out the first output step (209);
The first increment step (206), with intermediate variable (Addition_SIR (i)) increase (1-Bler_target (i)) * Upstep of type of service i, (1-Bler_target (i)) * Upstep represents the product of (1-Bler_target (i)) and Upstep;
Whether the 3rd determining step (207), the intermediate variable (Addition_SIR (i)) of judging type of service i greater than second thresholding, second thresholding be target SIR adjust upward step-length Upstep, if then carry out the following the 3rd and produce step (208); Carry out the second generation step (205) otherwise change over to;
The 3rd produces step (208), produces target SIR and adjusts upward order;
The first output step (209), the target SIR adjustment order that outgoing traffic type i produces.
Described third step (3) further comprises following substep:
Receive the target SIR adjustment order (300) of all types of service;
Whether the 4th determining step (301) has the requirement target SIR to adjust upward order in the target SIR adjustment order of the business that judgement is received, if order is carried out following steps 302; If not, change execution in step 304 over to;
The second depreciation step (302) the intermediate variable Addition_SIR that all are professional reduces Upstep;
The 4th produces step (303), produces target SIR and adjusts upward order, changes over to carry out the second output step (310);
Whether the 5th determining step (304) has the requirement target SIR in the target SIR adjustment order of the business that judgement is received and adjusts order downwards, if order is carried out the 6th determining step (305); If not, change over to and carry out the 6th generation step (309);
The 6th determining step (305) judges that the described target SIR that requires adjusts the highest activating service of exterior ring power control priority whether order corresponding service type is described business downwards, if order enters the second increment step (306); If not, change over to and carry out the 3rd increment step (308);
The second increment step (306), the intermediate variable that all are professional (Addition_SIR) increases Downstep;
The 5th produces step (307), produces target SIR and adjusts order downwards, changes over to carry out the second output step (310);
The 3rd increment step (308) increases Downstep with the described intermediate variable Addition_SIR (i) that requires target SIR to adjust the order corresponding service downwards;
The 6th produces step (309), produces the target SIR order that remains unchanged;
The second output step (310), the final target SIR adjustment order that produces of output.
Described the 4th step (4) further comprises following substep:
Receive final objective SIR and adjust order (400);
The 7th determining step (401) judges that the final objective SIR that is received adjusts order and whether requires to raise the sir target value, if order enters the 4th increment step (402); If not, change the 8th determining step (403) over to;
The 4th increment step (402) increases the sir target value with step-length Upstep, changes over to carry out the 3rd output step (406);
The 8th determining step (403) judges that the final objective SIR that is received adjusts order and whether requires to reduce the sir target value, if order enters depreciation step (404); If not, change maintenance step (405) over to;
The 3rd depreciation step (404) reduces the sir target value with step-length Downstep, changes over to carry out the 3rd output step (406);
Keep step (405), keep the sir target value constant;
The 3rd output step (406), the sir target value after output is upgraded.
According to second aspect present invention, provide a kind of in cdma system the multiplexing exterior ring power control system on same physical channel time of multiple business, comprising:
The service priority collator, the exterior ring power that just defines miscellaneous service according to the required sir target value of business is controlled priority, and professional required sir target value is high more, and corresponding priorities is high more;
The target SIR adjustment order generating apparatus of every kind of business is according to its received signal quality and QoS target generation target SIR adjustment order separately;
Target SIR adjustment order merges device, all professional target SIR adjustment orders is closed and is handled, and export final sir target adjustment order;
Sir target value updating device according to the final sir target adjustment order of receiving, upgrades all professional common sir target values.
The target SIR adjustment order generating apparatus of described every kind of business further comprises as lower unit:
First judging unit (201) for every kind of type of service i, judges that according to the signal quality of received type of service i whether transmission block correctly receives, and wherein represents i class type of service with type of service i;
The first depreciation unit (202), judging transmission block when first judging unit (201) is when correctly receiving, the intermediate variable (Addition_SIR (i)) of type of service i is deducted Bler_target (i) * Upstep, wherein, the target Block Error Rate (BLER) of BLER_target (i) expression type of service i, Upstep represents the step-length that adjusts upward of target SIR, and Bler_target (i) * Upstep represents the product of Bler_target (i) and Upstep;
Second judging unit (203), after the first depreciation unit deducts Bler_target (i) * Upstep with the intermediate variable (Addition_SIR (i)) of type of service i, whether the intermediate variable of the second judgment unit judges type of service i (Addition_SIR (i)) is less than first thresholding-Downstep, Downstep is the downward adjustment step-length of target SIR, and-Downstep is the negative value of the downward adjustment step-length of target SIR;
First generation unit (204), if second judging unit (203) judged result is that the intermediate variable (Addition_SIR (i)) of type of service i is less than first thresholding-Downstep, Downstep, then first generation unit produces target SIR and adjusts order downwards, and the target SIR that is produced is adjusted order downwards export to target SIR adjustment order merging device (209);
Second generation unit (205), if second judging unit (203) judged result is that the intermediate variable (Addition_SIR (i)) of type of service i is not less than first thresholding-Downstep, Downstep, then second generation unit produces the target SIR order that remains unchanged, and the target SIR that the is produced order that remains unchanged is exported to target SIR adjustment order and merged device (209);
The first increment unit (206), when first judging unit (201) is judged transmission block less than correct the reception, the first increment unit increases (1-Bler_target (i)) * Upstep with the intermediate variable (Addition_SIR (i)) of type of service i, and (1-Bler_target (i)) * Upstep represents the product of (1-Bler_target (i)) and Upstep;
The 3rd judging unit (207), after the first increment unit intermediate variable (Addition_SIR (i)) increase (1-Bler_target (i)) * Upstep with type of service i, whether the intermediate variable of the 3rd judgment unit judges type of service i (Addition_SIR (i)) is greater than second thresholding, second thresholding be target SIR adjust upward step-length Upstep, if then carry out the following the 3rd and produce step (208); Carry out the second generation step (205) otherwise change over to;
The 3rd produces unit (208), if the judged result of the 3rd judging unit is that the intermediate variable (Addition_SIR (i)) of type of service i is greater than second thresholding, then the 3rd produce the unit and produce target SIR and adjust upward order, and the target SIR that is produced is adjusted upward order export to target SIR adjustment order and merge device (209).
Described target SIR adjustment order merges device and further comprises as lower unit:
Receive the unit (300) of the target SIR adjustment order of all types of service;
Whether the 4th judging unit (301) has the requirement target SIR to adjust upward order in the target SIR adjustment order of the business that judgement is received;
The second depreciation unit (302), have the requirement target SIR to adjust upward order in the judged result of the 4th judging unit is the target SIR adjustment order of the business that received, then the second depreciation unit intermediate variable Addition_SIR that all are professional reduces Upstep;
The 4th generation unit (303), after the second depreciation unit intermediate variable Addition_SIR that all are professional reduces Upstep, the 4th generation unit produces target SIR and adjusts upward order, and the target SIR that is produced is adjusted upward order exports to sir target value updating device (310);
The 5th judging unit (304), do not require target SIR to adjust upward order in the judged result of the 4th judging unit is the target SIR adjustment order of the business that received, the 5th judging unit will judge that whether having the requirement target SIR in the target SIR adjustment order of the business that is received adjusts order downwards;
The 6th judging unit (305), if the judged result of the 5th judging unit is to have the requirement target SIR in the target SIR adjustment order of the business that received to adjust order downwards, then whether described to require target SIR to adjust order corresponding service type downwards be the highest activating service of exterior ring power control priority of described business to the 6th judgment unit judges;
The second increment unit (306), adjust the highest activating service of exterior ring power control priority that order corresponding service type is described business downwards if the judged result of the 6th judging unit is the described target SIR that requires, then the second increment unit intermediate variable (Addition_SIR) that all are professional increases Downstep;
The 5th generation unit (307), after the second increment unit intermediate variable (Addition_SIR) that all are professional increases Downstep, the 5th generation unit produces target SIR and adjusts order downwards, and the target SIR that is produced is adjusted order downwards export to sir target value updating device (310);
The 3rd increment unit (308), adjust the highest activating service of exterior ring power control priority that order corresponding service type is not described business downwards if the judged result of the 6th judging unit is the described target SIR that requires, then the 3rd increment unit increases Downstep with the described intermediate variable Addition_SIR (i) that requires target SIR to adjust the order corresponding service downwards;
The 6th generation unit (309), the 3rd increment unit with described require intermediate variable Addition_SIR (i) that target SIR adjusts the order corresponding service downwards increase Downstep after or the judged result of the 5th judging unit (304) be when not having the requirement target SIR in the target SIR adjustment order of the business that received and adjusting order downwards, the 6th generation unit produces the target SIR order that remains unchanged, and sir target value updating device (310) is exported in the target SIR that the is produced order that remains unchanged.
Described sir target value updating device (4) further comprises as lower unit:
Receive the unit (400) that final objective SIR adjusts order;
The 7th judging unit (401) judges that the final objective SIR that is received adjusts order and whether requires to raise the sir target value;
Order request rise sir target value is adjusted if the judged result of the 7th judging unit (401) is the final objective SIR that is received in the 4th increment unit (402), and then the 4th increment unit increases the sir target value with step-length Upstep;
The 8th judging unit (403), do not require rise sir target value if the judged result of the 7th judging unit (401) is the final objective SIR adjustment order that is received, then the 8th judging unit (403) judges the final objective SIR that is received adjusts to order whether require to reduce the sir target value;
The 3rd depreciation unit (404), if the 8th declares the final objective SIR adjustment order request downward modulation sir target value that new unit judges receives, then the 3rd depreciation unit (404) reduces the sir target value with step-length Downstep, and the sir target value after will reducing is exported to output unit (406);
Holding unit (405) does not require downward modulation sir target value if the judged result of the 8th judging unit is the final objective SIR adjustment order that is received, and it is constant that then holding unit keeps the sir target value, and give output unit (406) with the output of sir target value;
Output unit (406), the sir target value after output is upgraded.
Outer-loop power controlling method in the cdma system that the present invention proposes under the multi-business multiplexing situation, every kind of business is according to its received signal quality and QoS target generation target SIR adjustment order separately, according to the merging method that above provides all professional target SIR adjustment orders are merged processing then, at last common sir target value is adjusted.Because every kind of business is had local sir target value separately no longer, this exterior ring power control ring that causes because every kind of business has local sir target value separately with regard to fundamentally having overcome in the prior art is passed by control problem.Simultaneously, because when all professional SIR adjustment orders are merged, the intermediate variable of miscellaneous service correspondence can interact, the variation of public sir target value is had memory effect, thereby can follow the tracks of the required public sir target value variation that causes because of the transformat variation fast, solve professional outer shroud when activating and mourn in silence conversion between two states and crossed control problem, thereby obtained good outer ring power control performance under the multi-business multiplexing situation.
Description of drawings
Fig. 1 is the flow chart of patent US 2003/0036403 technical scheme.
Fig. 2 is the enforcement block diagram of patent US 2004/0082301 technical scheme.
Fig. 3 is that the outer-loop power controlling method under the multi-business multiplexing situation is implemented block diagram in the cdma system that proposes of the present invention;
Fig. 4 a is the every kind of professional flow chart that produces its target SIR adjustment command method that the present invention relates to;
Fig. 4 b is the every kind of professional block diagram that produces its target SIR adjustment command device that the present invention relates to;
Fig. 5 a is the flow chart to all business objective SIR adjustment order merging methods that the present invention relates to;
Fig. 5 b is the block diagram that the target SIR adjustment order of every kind of business the present invention relates to merges device;
Fig. 6 a is the flow chart of the sir target value update method that the present invention relates to;
Fig. 6 b is the block diagram of the sir target value updating device that the present invention relates to.
Embodiment
Be described in further detail below in conjunction with the enforcement of accompanying drawing technical solution of the present invention.
Fig. 3 be the present invention propose be used for the cdma system multi-business multiplexing on same physical channel the time outer-loop power controlling method and the embodiment block diagram of system.In this embodiment, at first, service priority sequencing unit 100 will just define the exterior ring power control priority of miscellaneous service according to the required sir target value of business, and professional required sir target value is high more, and corresponding priorities is high more; Secondly, the target SIR adjustment order generating apparatus 101 of every kind of business comprises the target SIR adjustment order generating apparatus 1011,1012,1013 that each is professional ... 101n, will be according to its received signal quality and QoS target generation target SIR adjustment order separately; Then, target SIR adjustment order merging device 102 will merge processing and export final sir target adjustment order all professional target SIR adjustment orders; At last, sir target value updating device 103 upgrades all professional common sir target values according to the final sir target adjustment order of receiving.
In this embodiment, be used for the multiplexing outer-loop power controlling method on same physical channel time of cdma system multiple business, comprised following steps:
First step (1), multiplexing on same physical channel the time in multiple business, just define the priority of the exterior ring power control of miscellaneous service according to the required sir target value of business, professional required sir target value requires high more, and its priority is high more;
Second step (2), for every kind of business, received signal quality and quality of service desired value or QoS target according to every kind of received business, produce separately target SIR adjustment order according to the method that pre-defines, described target SIR adjustment order comprises that the requirement target SIR adjusts order downwards, requires target SIR to adjust upward the order that remains unchanged of order and target SIR;
Third step (3), all received professional target SIR adjustment orders are merged processing according to the method that pre-defines, produce final objective SIR and adjust order, wherein, when having the requirement target SIR when not requiring target SIR to adjust upward order in the target SIR adjustment order of received business and adjust order downwards, produce final objective SIR according to defined priority and adjust order;
The 4th step (4) is adjusted order according to final objective SIR, the time sir target value upgrade.
In this embodiment, be used for the multiplexing exterior ring power control system on same physical channel time of cdma system multiple business, comprised with lower device:
The target SIR adjustment order generating apparatus 101 of every kind of business is according to its received signal quality and QoS target generation target SIR adjustment order separately;
Target SIR adjustment order merges device 102, all professional target SIR adjustment orders is closed and is handled, and export final sir target adjustment order;
Sir target value updating device 103 according to the final sir target adjustment order of receiving, upgrades all professional common sir target values.
Fig. 4 a and Fig. 4 b show for received signal quality and quality of service desired value or the QoS target of every kind of business according to every kind of received business, produce an embodiment of target SIR adjustment order separately according to the method that pre-defines.
Fig. 4 a is the every kind of professional flow chart that produces its target SIR adjustment command method that the present invention relates to, and this logic flow starts from step 200, ends at step 209.Suppose that present type of service is I.
Step 204 produces target SIR and adjusts order downwards, changes step 209 over to.
Step 205 produces the target SIR order that remains unchanged, and changes step 209 over to;
Step 208 produces target SIR and adjusts upward order, and order enters step 209.
Step 209 outputs to target SIR adjustment order with the target SIR adjustment order of every kind of business and merges device.
Fig. 4 b is the block diagram of the target SIR adjustment order generating apparatus of every kind of business the present invention relates to.
The target SIR adjustment order generating apparatus of every kind of business comprises:
The first judging unit 201a for every kind of type of service i, judges that according to the signal quality of received type of service i whether transmission block correctly receives, and wherein represents i class type of service with type of service i;
The first depreciation unit 202a, when the first judging unit 201a judges transmission block is when correctly receiving, the intermediate variable (Addition_SIR (i)) of type of service i is deducted Bler_target (i) * Upstep, wherein, the target Block Error Rate (BLER) of BLER_target (i) expression type of service i, Upstep represents the step-length that adjusts upward of target SIR, and Bler_target (i) * Upstep represents the product of Bler_target (i) and Upstep;
The second judging unit 203a, after the first depreciation unit deducts Bler_target (i) * Upstep with the intermediate variable (Addition_SIR (i)) of type of service i, whether the intermediate variable of the second judgment unit judges type of service i (Addition_SIR (i)) is less than first thresholding-Downstep, Downstep is the downward adjustment step-length of target SIR, and-Downstep is the negative value of the downward adjustment step-length of target SIR;
The first generation unit 204a, if second judging unit (203) judged result is that the intermediate variable (Addition_SIR (i)) of type of service i is less than first thresholding-Downstep, Downstep, then first generation unit produces target SIR and adjusts order downwards, and the target SIR that is produced is adjusted order downwards export to target SIR adjustment order merging device 209;
The second generation unit 205a, if the second judging unit 203a judged result is that the intermediate variable (Addition_SIR (i)) of type of service i is not less than first thresholding-Downstep, then second generation unit produces the target SIR order that remains unchanged, and the target SIR that the is produced order that remains unchanged is exported to target SIR adjustment order and merged device 209;
The first increment unit 206a, when the first judging unit 201a judges transmission block less than correct the reception, the first increment unit increases (1-Bler_target (i)) * Upstep with the intermediate variable (Addition_SIR (i)) of type of service i, and (1-Bler_target (i)) * Upstep represents the product of (1-Bler_target (i)) and Upstep;
The 3rd judging unit 207a, after the first increment unit intermediate variable (Addition_SIR (i)) increase (1-Bler_target (i)) * Upstep with type of service i, whether the intermediate variable of the 3rd judgment unit judges type of service i (Addition_SIR (i)) greater than second thresholding, second thresholding be target SIR adjust upward step-length Upstep;
The 3rd produces unit 208a, if the judged result of the 3rd judging unit is that the intermediate variable (Addition_SIR (i)) of type of service i is greater than second thresholding, then the 3rd produce the unit and produce target SIR and adjust upward order, and the target SIR that is produced is adjusted upward order export to target SIR adjustment order and merge device 209.
The application's the first judging unit 201a, the first depreciation unit 202a, the second judging unit 203a, the first generation unit 204a, the second generation unit 205a, first increment unit 206a, the 3rd judging unit 207a and the 3rd produce unit 208a can by prior art can realize its separately the combination of hardware, software or the hardware and software of function implement.
Fig. 5 a is the flow chart to all business objective SIR adjustment order merging methods that the present invention relates to.
This logic flow starts from step 300, ends at step 310.Suppose that present type of service is I.
Step 300 receives the target SIR adjustment order from the type of service i of target SIR adjustment order merge cells, and order enters step 301.
Step 301 judges whether to require to raise the sir target value.If order enters step 302; If not, change step 304 over to.
Step 303 produces target SIR and adjusts upward order, changes step 310 over to.
Step 304 judges whether to require the sir target value to adjust downwards.If order enters step 305; If not, change step 309 over to.
Step 305 is judged the whether the highest activating service of priority of present type of service i.If order enters step 306; If not, change step 308 over to.
Step 307 produces target SIR and adjusts order downwards, changes step 310 over to.
Step 309 produces the target SIR order that remains unchanged, and order enters step 310.
Step 310 outputs to sir target value updating device with the target SIR adjustment order that merges the back generation.
The application adjusts the merging method of order to all business objective SIR, Fig. 5 and step 300 have been embodied in to the detailed description of step 310, its core concept is: any business need raises target SIR, all can raise target SIR, but can carry out corresponding reducing to all professional intermediate variables simultaneously; When having only the highest business need of activating service medium priority to reduce target SIR, just can reduce target SIR, but can carry out corresponding add operation to all professional intermediate variables simultaneously.
Fig. 5 b is the block diagram that the target SIR adjustment order of every kind of business the present invention relates to merges device.Described target SIR adjustment order merges device and further comprises as lower unit:
Receive the unit 300 of the target SIR adjustment order of all types of service;
Whether the 4th judging unit 301a has the requirement target SIR to adjust upward order in the target SIR adjustment order of the business that judgement is received;
The second depreciation unit 302a has the requirement target SIR to adjust upward order in the judged result of the 4th judging unit is the target SIR adjustment order of the business that received, and then the second depreciation unit intermediate variable Addition_SIR that all are professional reduces Upstep;
The 4th generation unit 303a, after the second depreciation unit intermediate variable Addition_SIR that all are professional reduces Upstep, the 4th generation unit produces target SIR and adjusts upward order, and the target SIR that is produced is adjusted upward order exports to sir target value updating device 310;
The 5th judging unit 304, do not require target SIR to adjust upward order in the judged result of the 4th judging unit is the target SIR adjustment order of the business that received, the 5th judging unit will judge that whether having the requirement target SIR in the target SIR adjustment order of the business that is received adjusts order downwards;
The 6th judging unit 305a, if the judged result of the 5th judging unit is to have the requirement target SIR in the target SIR adjustment order of the business that received to adjust order downwards, then whether described to require target SIR to adjust order corresponding service type downwards be the highest activating service of exterior ring power control priority of described business to the 6th judgment unit judges;
The second increment unit 306a, adjust the highest activating service of exterior ring power control priority that order corresponding service type is described business downwards if the judged result of the 6th judging unit is the described target SIR that requires, then the second increment unit intermediate variable (Addition_SIR) that all are professional increases Downstep;
The 5th generation unit 307a, after the second increment unit intermediate variable (Addition_SIR) that all are professional increases Downstep, the 5th generation unit produces target SIR and adjusts order downwards, and the target SIR that is produced is adjusted order downwards export to sir target value updating device 310;
The 3rd increment unit 308a, adjust the highest activating service of exterior ring power control priority that order corresponding service type is not described business downwards if the judged result of the 6th judging unit is the described target SIR that requires, then the 3rd increment unit increases Downstep with the described intermediate variable Addition_SIR (i) that requires target SIR to adjust the order corresponding service downwards;
The 6th generation unit 309a, the 3rd increment unit with described require intermediate variable Addition_SIR (i) that target SIR adjusts the order corresponding service downwards increase Downstep after or the judged result of the 5th judging unit 304a be when not having the requirement target SIR in the target SIR adjustment order of the business that received and adjusting order downwards, the 6th generation unit produces the target SIR order that remains unchanged, and sir target value updating device 310 is exported in the target SIR that the is produced order that remains unchanged.
The application's target SIR adjustment order merges device, receive the unit 300 of the target SIR adjustment order of all types of service, the 4th judging unit 301a, the second depreciation unit 302a, the 4th generation unit 303a, the 5th judging unit 304a, the 6th judging unit 305a, the second increment unit 306a, the 5th generation unit 307a, the 3rd increment unit 308a, and the 6th generation unit 309a can be by prior art can realize its hardware of function separately, the combination of software or hardware and software is implemented.
Fig. 6 a is the flow chart of the sir target value update method that the present invention relates to.
This logic flow starts from step 400, ends at step 406.
Step 401 judges whether to require to raise the sir target value, if order enters step 402; If not, change step 403 over to.
Step 402 increases the sir target value with step-length Upstep, changes step 406 over to.
Step 403 judges whether to require downward modulation sir target value, if order enters step 404; If not, change step 405 over to.
Step 404 reduces the sir target value with step-length Downstep, changes step 406 over to.
Step 405 keeps the sir target value constant, and order enters step 406.
Sir target value after step 406 output is upgraded.
Fig. 6 b is the block diagram of sir target value updating device of the present invention.Be characterised in that described sir target value updating device further comprises as lower unit: receive the unit 400a that final objective SIR adjusts order; The 7th judging unit 401a judges that the final objective SIR that is received adjusts order and whether requires to raise the sir target value; The 4th increment unit 402a adjusts order request rise sir target value if the judged result of the 7th judging unit 401a is the final objective SIR that is received, and then the 4th increment unit increases the sir target value with step-length Upstep; The 8th judging unit 403a, do not require rise sir target value if the judged result of the 7th judging unit 401a is the final objective SIR adjustment order that is received, then the 8th judging unit 403a judges the final objective SIR that is received adjusts to order whether require to reduce the sir target value; The 3rd depreciation unit 404a, if the final objective SIR that the 8th judgment unit judges is received adjusts order request downward modulation sir target value, then the 3rd depreciation unit 404a reduces the sir target value with step-length Downstep, and the sir target value after will reducing is exported to output unit 406a; Holding unit 405a does not require downward modulation sir target value if the judged result of the 8th judging unit is the final objective SIR adjustment order that is received, and it is constant that then holding unit keeps the sir target value, and give output unit 406a with the output of sir target value; Output unit 406a, the sir target value after output is upgraded.
The application's sir target value updating device, receive unit 400a, the 7th judging unit 401a that final objective SIR adjusts order, the 4th increment unit 402a, the 8th judging unit 403a, the 3rd depreciation unit 404a, holding unit 405a and output unit 406a can by prior art can realize its separately the combination of hardware, software or the hardware and software of function implement.
Claims (10)
1. multiplexing outer-loop power controlling method on same physical channel time of multiple business in cdma system may further comprise the steps:
First step, multiplexing on same physical channel the time in multiple business, just define the priority of the exterior ring power control of miscellaneous service according to the required sir target value of business, professional required sir target value requires high more, and its priority is high more;
Second step, for every kind of business, received signal quality and quality of service desired value according to every kind of received business, produce target SIR adjustment order separately, described target SIR adjustment order comprises that the requirement target SIR adjusts order downwards, requires target SIR to adjust upward the order that remains unchanged of order and target SIR;
Third step, all received professional target SIR adjustment orders are merged processing, produce final objective SIR and adjust order, wherein, when having the requirement target SIR when not requiring target SIR to adjust upward order in the target SIR adjustment order of received business and adjust order downwards, produce final objective SIR according to defined priority and adjust order;
The 4th step is adjusted order according to final objective SIR, and the sir target value is upgraded.
2. the method for claim 1 is characterized in that described second step (2) further comprises following substep:
First determining step (201) for every kind of type of service i, judges according to the signal quality of received type of service i whether transmission block correctly receives, if then carry out the first depreciation step (202); If not, then change over to and carry out the first increment step (206), wherein represent i class type of service with type of service i;
The first depreciation step (202), the intermediate variable Addition_SIR (i) of type of service i is deducted Bler_target (i) * Upstep, wherein, the target block error rate BLER of BLER_target (i) expression type of service i, Upstep represents the step-length that adjusts upward of target SIR, and Bler_target (i) * Upstep represents the product of Bler_target (i) and Upstep;
Second determining step (203), whether the intermediate variable Addition_SIR (i) that judges type of service i is less than first thresholding-Downstep, Downstep is the downward adjustment step-length of target SIR,-Downstep is the negative value of the downward adjustment step-length of target SIR, if then carry out first and produce step (204); Carry out the second generation step (205) otherwise change over to;
First produces step (204), produces target SIR and adjusts order downwards, changes over to carry out the first output step (209);
Second produces step (205), produces the target SIR order that remains unchanged; Change over to and carry out the first output step (209);
The first increment step (206), with intermediate variable Addition_SIR (i) increase (1-Bler_target (i)) * Upstep of type of service i, (1-Bler_target (i)) * Upstep represents the product of (1-Bler_target (i)) and Upstep;
Whether the 3rd determining step (207), the intermediate variable Addition_SIR (i) that judges type of service i greater than second thresholding, second thresholding be target SIR adjust upward step-length Upstep, if then carry out the following the 3rd and produce step (208); Carry out the second generation step (205) otherwise change over to;
The 3rd produces step (208), produces target SIR and adjusts upward order;
The first output step (209), the target SIR adjustment order that outgoing traffic type i produces.
3. method as claimed in claim 1 or 2 is characterized in that described third step (3) further comprises following substep:
Receive the target SIR adjustment order (300) of all types of service;
Whether the 4th determining step (301) has the requirement target SIR to adjust upward order in the target SIR adjustment order of the business that judgement is received, if order is carried out the second depreciation step (302); If not, change over to and carry out the 5th determining step (304);
The second depreciation step (302) the intermediate variable Addition_SIR that all are professional reduces Upstep;
The 4th produces step (303), produces target SIR and adjusts upward order, changes over to carry out the second output step (310);
Whether the 5th determining step (304) has the requirement target SIR in the target SIR adjustment order of the business that judgement is received and adjusts order downwards, if order is carried out the 6th determining step (305); If not, change over to and carry out the 6th generation step (309);
The 6th determining step (305) judges that the described target SIR that requires adjusts the highest activating service of exterior ring power control priority whether order corresponding service type is described business downwards, if order enters the second increment step (306); If not, change over to and carry out the 3rd increment step (308);
The second increment step (306), the intermediate variable Addition_SIR that all are professional increases Downstep;
The 5th produces step (307), produces target SIR and adjusts order downwards, changes over to carry out the second output step (310);
The 3rd increment step (308) increases Downstep with the described intermediate variable Addition_SIR (i) that requires target SIR to adjust the order corresponding service downwards;
The 6th produces step (309), produces the target SIR order that remains unchanged;
The second output step (310), the final target SIR adjustment order that produces of output.
4. method as claimed in claim 1 or 2 is characterized in that described the 4th step (4) further comprises following substep:
Receive final objective SIR and adjust order (400);
The 7th determining step (401) judges that the final objective SIR that is received adjusts order and whether requires to raise the sir target value, if order enters the 4th increment step (402); If not, change the 8th determining step (403) over to;
The 4th increment step (402) increases the sir target value with step-length Upstep, changes over to carry out the 3rd output step (406);
The 8th determining step (403) judges that the final objective SIR that is received adjusts order and whether requires to reduce the sir target value, if order enters depreciation step (404); If not, change maintenance step (405) over to;
The 3rd depreciation step (404) reduces the sir target value with step-length Downstep, changes over to carry out the 3rd output step (406);
Keep step (405), keep the sir target value constant;
The 3rd output step (406), the sir target value after output is upgraded.
5. method as claimed in claim 3 is characterized in that described the 4th step (4) further comprises following substep:
Receive final objective SIR and adjust order (400);
The 7th determining step (401) judges that the final objective SIR that is received adjusts order and whether requires to raise the sir target value, if order enters the 4th increment step (402); If not, change the 8th determining step (403) over to;
The 4th increment step (402) increases the sir target value with step-length Upstep, changes over to carry out the 3rd output step (406);
The 8th determining step (403) judges that the final objective SIR that is received adjusts order and whether requires to reduce the sir target value, if order enters depreciation step (404); If not, change maintenance step (405) over to;
The 3rd depreciation step (404) reduces the sir target value with step-length Downstep, changes over to carry out the 3rd output step (406);
Keep step (405), keep the sir target value constant;
The 3rd output step (406), the sir target value after output is upgraded.
6. multiplexing exterior ring power control system on same physical channel time of multiple business in cdma system comprises:
Service priority collator (100), the exterior ring power that just defines miscellaneous service according to the required sir target value of business is controlled priority, and professional required sir target value is high more, and corresponding priorities is high more;
The target SIR adjustment order generating apparatus (101) of every kind of business is according to its received signal quality and QoS target generation target SIR adjustment order separately;
Target SIR adjustment order merges device (102), all professional target SIR adjustment orders is merged processing, and export final sir target adjustment order;
Sir target value updating device (103) according to the final sir target adjustment order of receiving, upgrades all professional common sir target values.
7. system as claimed in claim 6 is characterized in that the target SIR adjustment order generating apparatus of described every kind of business further comprises as lower unit:
First judging unit (201a) for every kind of type of service i, judges that according to the signal quality of received type of service i whether transmission block correctly receives, and wherein represents i class type of service with type of service i;
The first depreciation unit (202a), judging transmission block when first judging unit (201a) is when correctly receiving, the intermediate variable Addition_SIR (i) of type of service i is deducted Bler_target (i) * Upstep, wherein, the target block error rate BLER of BLER_target (i) expression type of service i, Upstep represents the step-length that adjusts upward of target SIR, and Bler_target (i) * Upstep represents the product of Bler_target (i) and Upstep;
Second judging unit (203a), after the first depreciation unit deducts Bler_target (i) * Upstep with the intermediate variable Addition_SIR (i) of type of service i, whether the intermediate variable Addition_SIR (i) of the second judgment unit judges type of service i is less than first thresholding-Downstep, Downstep is the downward adjustment step-length of target SIR, and-Downstep is the negative value of the downward adjustment step-length of target SIR;
First generation unit (204a), if second judging unit (203a) judged result is that the intermediate variable Addition_SIR (i) of type of service i is less than first thresholding-Downstep, then first generation unit produces target SIR and adjusts order downwards, and the target SIR that is produced is adjusted order downwards export to target SIR adjustment order merging device (209);
Second generation unit (205a), if second judging unit (203a) judged result is that the intermediate variable Addition_SIR (i) of type of service i is not less than first thresholding-Downstep, then second generation unit produces the target SIR order that remains unchanged, and the target SIR that the is produced order that remains unchanged is exported to target SIR adjustment order and merged device (209);
The first increment unit (206a), when first judging unit (201a) is judged transmission block less than correct the reception, the first increment unit increases (1-Bler_target (i)) * Upstep with the intermediate variable Addition_SIR (i) of type of service i, and (1-Bler_target (i)) * Upstep represents the product of (1-Bler_target (i)) and Upstep;
The 3rd judging unit (207a), after the first increment unit intermediate variable Addition_SIR (i) increase (1-Bler_target (i)) * Upstep with type of service i, whether the intermediate variable Addition_SIR (i) of the 3rd judgment unit judges type of service i is greater than second thresholding, second thresholding be target SIR adjust upward step-length Upstep, if then carry out the following the 3rd and produce step (208a); Carry out the second generation step (205a) otherwise change over to;
The 3rd produces unit (208a), if the judged result of the 3rd judging unit is that the intermediate variable Addition_SIR (i) of type of service i is greater than second thresholding, then the 3rd produce the unit and produce target SIR and adjust upward order, and the target SIR that is produced is adjusted upward order export to target SIR adjustment order and merge device (209).
8. as claim 6 or 7 described systems, it is characterized in that described target SIR adjustment order merges device and further comprises as lower unit:
Receive the unit (300a) of the target SIR adjustment order of all types of service;
Whether the 4th judging unit (301a) has the requirement target SIR to adjust upward order in the target SIR adjustment order of the business that judgement is received;
The second depreciation unit (302a), have the requirement target SIR to adjust upward order in the judged result of the 4th judging unit is the target SIR adjustment order of the business that received, then the second depreciation unit intermediate variable Addition_SIR that all are professional reduces Upstep;
The 4th generation unit (303a), after the second depreciation unit intermediate variable Addition_SIR that all are professional reduces Upstep, the 4th generation unit produces target SIR and adjusts upward order, and the target SIR that is produced is adjusted upward order exports to sir target value updating device (310);
The 5th judging unit (304a), do not require target SIR to adjust upward order in the judged result of the 4th judging unit is the target SIR adjustment order of the business that received, the 5th judging unit will judge that whether having the requirement target SIR in the target SIR adjustment order of the business that is received adjusts order downwards;
The 6th judging unit (305a), if the judged result of the 5th judging unit is to have the requirement target SIR in the target SIR adjustment order of the business that received to adjust order downwards, then whether described to require target SIR to adjust order corresponding service type downwards be the highest activating service of exterior ring power control priority of described business to the 6th judgment unit judges;
The second increment unit (306a), adjust the highest activating service of exterior ring power control priority that order corresponding service type is described business downwards if the judged result of the 6th judging unit is the described target SIR that requires, then the second increment unit intermediate variable Addition_SIR that all are professional increases Downstep;
The 5th generation unit (307a), after the second increment unit intermediate variable Addition_SIR that all are professional increases Downstep, the 5th generation unit produces target SIR and adjusts order downwards, and the target SIR that is produced is adjusted order downwards export to sir target value updating device (310);
The 3rd increment unit (308a), adjust the highest activating service of exterior ring power control priority that order corresponding service type is not described business downwards if the judged result of the 6th judging unit is the described target SIR that requires, then the 3rd increment unit increases Downstep with the described intermediate variable Addition_SIR (i) that requires target SIR to adjust the order corresponding service downwards;
The 6th generation unit (309a), the 3rd increment unit with described require intermediate variable Addition_SIR (i) that target SIR adjusts the order corresponding service downwards increase Downstep after or the judged result of the 5th judging unit (304a) be when not having the requirement target SIR in the target SIR adjustment order of the business that received and adjusting order downwards, the 6th generation unit produces the target SIR order that remains unchanged, and sir target value updating device (310) is exported in the target SIR that the is produced order that remains unchanged.
9. as claim 6 or 7 described systems, it is characterized in that described sir target value updating device (103) further comprises as lower unit:
Receive the unit (400a) that final objective SIR adjusts order;
The 7th judging unit (401a) judges that the final objective SIR that is received adjusts order and whether requires to raise the sir target value;
Order request rise sir target value is adjusted if the judged result of the 7th judging unit (401a) is the final objective SIR that is received in the 4th increment unit (402a), and then the 4th increment unit increases the sir target value with step-length Upstep;
The 8th judging unit (403a), do not require rise sir target value if the judged result of the 7th judging unit (401a) is the final objective SIR adjustment order that is received, then the 8th judging unit (403a) judges the final objective SIR that is received adjusts to order whether require to reduce the sir target value;
The 3rd depreciation unit (404a), if the final objective SIR that the 8th judgment unit judges is received adjusts order request downward modulation sir target value, then the 3rd depreciation unit (404a) reduces the sir target value with step-length Downstep, and the sir target value after will reducing is exported to output unit (406a);
Holding unit (405a) does not require downward modulation sir target value if the judged result of the 8th judging unit is the final objective SIR adjustment order that is received, and it is constant that then holding unit keeps the sir target value, and give output unit (406a) with the output of sir target value;
Output unit (406a), the sir target value after output is upgraded.
10. system as claimed in claim 8 is characterized in that described sir target value updating device (103) further comprises as lower unit:
Receive the unit (400a) that final objective SIR adjusts order;
The 7th judging unit (401a) judges that the final objective SIR that is received adjusts order and whether requires to raise the sir target value;
Order request rise sir target value is adjusted if the judged result of the 7th judging unit (401a) is the final objective SIR that is received in the 4th increment unit (402a), and then the 4th increment unit increases the sir target value with step-length Upstep;
The 8th judging unit (403a), do not require rise sir target value if the judged result of the 7th judging unit (401a) is the final objective SIR adjustment order that is received, then the 8th judging unit (403a) judges the final objective SIR that is received adjusts to order whether require to reduce the sir target value;
The 3rd depreciation unit (404a), if the final objective SIR that the 8th judgment unit judges is received adjusts order request downward modulation sir target value, then the 3rd depreciation unit (404a) reduces the sir target value with step-length Downstep, and the sir target value after will reducing is exported to output unit (406a);
Holding unit (405a) does not require downward modulation sir target value if the judged result of the 8th judging unit is the final objective SIR adjustment order that is received, and it is constant that then holding unit keeps the sir target value, and give output unit (406a) with the output of sir target value;
Output unit (406a), the sir target value after output is upgraded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100509741A CN100429876C (en) | 2005-02-24 | 2005-02-24 | External ring power control method and system in CDMA system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100509741A CN100429876C (en) | 2005-02-24 | 2005-02-24 | External ring power control method and system in CDMA system |
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| CN1825777A CN1825777A (en) | 2006-08-30 |
| CN100429876C true CN100429876C (en) | 2008-10-29 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020115443A1 (en) * | 2000-12-14 | 2002-08-22 | Freiberg Lorenz Fred | Method of controlling quality of service |
| CN1113483C (en) * | 1997-06-16 | 2003-07-02 | 艾利森电话股份有限公司 | Multiple code channel power control in radio communication system |
| CN1457203A (en) * | 2002-05-07 | 2003-11-19 | 埃沃列姆公司 | External ring method and apparatus for controlling adjustable power and internal ring desired value |
| CN1486100A (en) * | 2002-09-26 | 2004-03-31 | Ut斯达康(中国)有限公司 | Method and system for outer ring power control based on selfadaptive error rate measuring |
| US20040152423A1 (en) * | 2003-01-30 | 2004-08-05 | Interdigital Technology Corporation | Link-quality estimation method and components for multi-user wireless communication systems |
-
2005
- 2005-02-24 CN CNB2005100509741A patent/CN100429876C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1113483C (en) * | 1997-06-16 | 2003-07-02 | 艾利森电话股份有限公司 | Multiple code channel power control in radio communication system |
| US20020115443A1 (en) * | 2000-12-14 | 2002-08-22 | Freiberg Lorenz Fred | Method of controlling quality of service |
| CN1457203A (en) * | 2002-05-07 | 2003-11-19 | 埃沃列姆公司 | External ring method and apparatus for controlling adjustable power and internal ring desired value |
| CN1486100A (en) * | 2002-09-26 | 2004-03-31 | Ut斯达康(中国)有限公司 | Method and system for outer ring power control based on selfadaptive error rate measuring |
| US20040152423A1 (en) * | 2003-01-30 | 2004-08-05 | Interdigital Technology Corporation | Link-quality estimation method and components for multi-user wireless communication systems |
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