CN1175607C - Method for carrying out equalized allocation under conditions of soft witching and multipath transmission - Google Patents
Method for carrying out equalized allocation under conditions of soft witching and multipath transmission Download PDFInfo
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- CN1175607C CN1175607C CNB021036284A CN02103628A CN1175607C CN 1175607 C CN1175607 C CN 1175607C CN B021036284 A CNB021036284 A CN B021036284A CN 02103628 A CN02103628 A CN 02103628A CN 1175607 C CN1175607 C CN 1175607C
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Abstract
The present invention relates to a method for realizing equalized allocation under conditions of soft switching and multi-path transmission, which comprises two steps respectively operated according to two principles. (1) firstly, multi-path allocation is carried out according to a cell principle to ensure that each activated collective cell has one path which is tracked and demodulated in a demodulation unit; (2) then, multi-path allocation is carried out according to an energy principle to ensure a path with strong signal intensity; the path with much energy is demodulated and joins merging so as to obtain maximum merging gain. The present invention is characterized in that the present invention can ensure that demodulation units in an RAKE receiver tracks and demodulates the multi-path information of each activated collective cell under the condition of soft switching. On one hand, the present invention can obtain the maximum gain of soft switching; on the other hand, the present invention ensures reasonable power control to each activated collective cell. In addition, the method of the present invention can be compatible in the condition of non-soft switching simultaneously.
Description
Technical field
The present invention relates to a kind of balanced method of distributing that under soft handover and multipath transmisstion condition, realizes, exactly, relate to a kind of in the spread spectrum communication field of technology such as CDMA2000, WCDMA, TD-SCDMA, the multipath information that each Cell searching in the Active Set under the soft handoff condition is come out realizes balanced the distribution, so that RAKE receiver obtains maximum diversity gain and the method that merges gain; Belong to the spread spectrum technic field.
Background technology
The position of multipath distribution method in whole mobile communication receiver of using as shown in Figure 1 at present.After signal process radio frequency that antenna receives and baseband processing module are handled, become the baseband signal of 4 samplings; This baseband signal becomes 2 sampling signals through the processing of down-sampled processing module again, and sends into the Multipath searching module; This baseband signal is sent into the RAKE receiver module and is carried out demodulation process simultaneously.The path transfer information of separating that multipath information that the comprehensive Multipath searching module detection of multipath distribution module searches for out and RAKE receiver module produce, each demodulating unit of multipath being distributed to the RAKE receiver module uses for demodulation.Wherein gather to be called and separate the path transfer set, comprising delay adjustment offset information, the energy information of each demodulating unit and the information that whether is being locked by the footpath of demodulation by the multipath of RAKE receiver module maintenance.The set of being safeguarded by the Multipath searching module is called the set of search footpath, comprising multidiameter, the multipath energy of each sub-district in the current Active Set.
Under soft handoff condition, receiver holds on a correspondence with several sub-districts simultaneously, the correctness of the footpath distribution method of this moment can directly have influence on receiver the size of obtainable soft handover gain, the allocation strategy of mistake can reduce soft handover gain greatly.In addition, the situation of compatible non-soft handover simultaneously also of the footpath allocation strategy under the soft handover.Present multipath distribution method mainly is that the energy size (being the intensity size) according to signal is distributed, and does not consider how to carry out multipath and distribute under soft handoff condition.Iff according to the energy distribution multipath, so under soft handoff condition, sub-district in the Active Set might occur not by demodulation, thereby soft handover gain there not be the shortcoming of acquisition yet.
Summary of the invention
The purpose of this invention is to provide a kind of balanced method of distributing that under soft handover and multipath transmisstion condition, realizes, to solve the existing in prior technology defective under soft handoff condition of present appearance.
The object of the present invention is achieved like this: a kind of method that realizes balanced distribution under soft handover and multipath transmisstion condition, comprise that carrying out multipath with the energy principle distributes, just guarantee the footpath of signal strength signal intensity maximum, be that mediation participation merging is being separated in the strongest footpath of energy, so that can obtain maximum merging gain; It is characterized in that: this method was at first carried out multipath with the sub-district principle and is distributed carry out the multipath distribution with the energy principle before, guaranteed that all there is the tracked demodulation in demodulating unit of a footpath sub-district in each Active Set.
Describedly carry out the operating procedure that multipath distributes with the sub-district principle and be:
(1) at first from separate the path transfer set, selects a demodulating unit;
(2) do you judge that this demodulating unit just locks in the footpath of demodulation? if the footpath non-locking of this demodulating unit institute demodulation then carries out (3) operating procedure; If this footpath locks, then carry out (4) operating procedure;
(3) in search footpath set, judge whether to comprise this demodulating unit just in the footpath of demodulation? if do not comprise this footpath, then carry out (5) operating procedure; If comprise this footpath, then carry out (6) operating procedure;
(4) to separating at present in the path transfer set, judge that it is by unique demodulating unit trace demodulation just in the footpath of demodulation? if a plurality of demodulating units are arranged in this same footpath of trace demodulation, then carry out (7) operating procedure; Otherwise carry out (10) operating procedure;
(5) demodulating unit of this losing lock is set to " free time ", carries out trace demodulation so that reassign a new footpath for the demodulating unit of this losing lock, and the indication of the zero clearing of this losing lock demodulating unit simultaneously is set to 1, carries out (10) operating procedure afterwards;
(6) keep this demodulating unit, it is original just in the footpath of demodulation to allow this demodulating unit continue tracking, carries out (10) operating procedure afterwards;
(7) do you judge that the signal energy of this demodulating unit is for the strongest? if energy is the strongest, carry out (8) operating procedure; Otherwise, carry out (9) operating procedure;
(8) keep the strongest demodulating unit of this energy and carry out trace demodulation, and each demodulating unit in other the same footpath of demodulation all is set to " free time ", these zero clearing indications that are set to the demodulating unit of " free time " simultaneously are set to 1; Carry out (10) operating procedure afterwards;
(9) this demodulating unit is set to " free time ", and this zero clearing indication that is set to the demodulating unit of " free time " simultaneously is set to 1; Carry out (10) operating procedure afterwards;
(10) judge whether other demodulating units in addition? if have, carry out (11) operating procedure; If no, carry out (12) operating procedure;
(11) select next demodulating unit, promptly turn back to (2) operating procedure;
(12) enter (two) step of balanced apportion design.
The zero clearing indication of described losing lock demodulating unit and demodulating unit is set at 1 o'clock, the expression zero clearing; Be set at 0 o'clock, represent not zero clearing.
Describedly carry out the operating procedure that multipath distributes with the energy principle and be:
(20) at first in the set of search footpath, select the strongest footpath of energy, be referred to as footpath to be allocated;
(21) judged whether this footpath to be allocated of demodulating unit demodulation? if have, then enter (22) operating procedure; If no, then enter (24) operating procedure;
(22) in the set of search footpath, judge whether to also have other footpaths not to be assigned with? if have, then enter (23) operating procedure; If no, then footpath distribution this time finishes;
(23) in the set of search footpath, select an energy time strong footpath, turn back to (21) operating procedure;
(24) judge whether to have the demodulating unit that is in " free time " state? if have, then enter (25) operating procedure; If no, then enter (26) operating procedure;
(25) this footpath to be allocated in distribution one " free time " demodulating unit trace demodulation search footpath set, and its " free time " state is set to " busy ", the footpath energy of this demodulating unit is set to the energy in this footpath to be allocated simultaneously, enters (22) operating procedure;
(26) do you judge whether all footpaths all belong to same sub-district in this footpath to be allocated and the set of search footpath? if belong to same sub-district, then enter (27) operating procedure; If not belonging to same sub-district, then enter (29) operating procedure;
(27) is the energy of judging this footpath to be allocated greater than 2 times of the current energy of separating the most weak footpath in the path transfer set? if greater than 2 times, then enter (28) operating procedure; If be not more than 2 times, then finish operation this time;
(28) will be just demodulation the demodulating unit in weak footpath distribute to this footpath to be allocated, and the footpath energy of this demodulating unit is set to the energy in this footpath to be allocated, carries out (22) operating procedure afterwards;
(29) in separating the path transfer set, select the most weak footpath of demodulating unit energy, carry out (30) operating procedure afterwards;
(30) do you judge that this footpath to be allocated belongs to same sub-district with the most weak footpath? if belong to same sub-district, enter (31) operating procedure; If do not belong to same sub-district, enter (33) operating procedure;
(31) is the energy of judging this footpath to be allocated greater than 2 times of the current energy of separating the most weak footpath in the path transfer set? if greater than 2 times, then enter (32) operating procedure; If be not more than 2 times, then enter (37) operating procedure;
(32) this demodulating unit is distributed to this footpath to be allocated, the footpath energy of this demodulating unit is set to the energy in this footpath to be allocated simultaneously, enters (22) operating procedure;
(33) do you judge that the most weak footpath separate in the path transfer set is that this sub-district unique separates path transfer? if the unique solution path transfer then enters (37) operating procedure; If not the unique solution path transfer, then enter (34) operating procedure;
(34) do you judge that this footpath to be allocated is arranged in the new sub-district of Active Set? if then enter (36) operating procedure; If not, then enter (35) operating procedure;
(35) is the energy of judging this footpath to be allocated greater than 2 times of the current energy of separating the most weak footpath in the path transfer set? if greater than 2 times, then enter (36) operating procedure; If be not more than 2 times, then enter (37) operating procedure;
(36) this demodulating unit is distributed to this footpath to be allocated, the footpath energy of this demodulating unit is set to the energy in footpath to be allocated simultaneously, enters (22) operating procedure;
(37) do you judge to separate whether also have other footpaths also not carry out judgment processing in the path transfer set? if have, then enter (38) operating procedure; If no, then enter (22) operating procedure;
(38) the energy time weak demodulating unit in the path transfer set is separated in selection, enters (29) operating procedure.
Characteristics of the present invention are that the multipath information that can guarantee each sub-district in the Active Set under soft handoff condition all has demodulating unit that it is being carried out trace demodulation in RAKE receiver, can obtain the highest soft handover gain so on the one hand, guarantee on the other hand rational power control is carried out in each sub-district in the Active Set.In addition, method of the present invention can compatible non-case of soft handover of while.
Description of drawings
Fig. 1 is the structural representation that carries out the multipath distribution method in mobile communication receiver.
Fig. 2 is the schematic flow sheet that the present invention realizes balanced distribution method.
Fig. 3 is the first step flow chart that the present invention realizes balanced distribution method.
Fig. 4 is second flow chart of steps that the present invention realizes balanced distribution method.
Embodiment
Referring to Fig. 2, the present invention is a kind of balanced method of distributing that realizes under soft handover and multipath transmisstion condition, and the main operation principle of this method is two basic principles: sub-district principle and energy principle.At first article one principle of Kao Lving is the sub-district principle, and it mainly is to guarantee that all there is the tracked demodulation in demodulating unit of a footpath each sub-district in the Active Set.The main cause of Kao Lving is like this: the main purpose of soft handover is in order to overcome near-far interference, when travelling carriage enters the another one sub-district from a sub-district, when perhaps being positioned at cell boarder, still can to keep original speech quality.Like this, the diversity gain that soft handover is provided can guarantee the speech quality of fringe region on the one hand, on the other hand, can carry out power control to the sub-district that is in soft changing state again, guarantee that travelling carriage is when constantly increasing distance, can improve transmitting power rightly, so that near the interference of base station becoming.Another benefit to all footpaths of cell allocation in the Active Set is can adjust more accurately regularly, thereby the emission of each sub-district in the maintenance Active Set and subscriber equipment (UE) receives regularly.
The present invention also will consider the second principle on the basis of above-mentioned article one principle: i.e. energy principle.Because what down link adopted is that high specific merges the method for (MRC), when high specific merged, the total signal to noise ratio after the merging was the signal to noise ratio sum of each branch road, signal to noise ratio high more branch road, the gain contribution of the signal after being combined is big more.Under the situation of cell load basis equalization, can think approx that the noise of each Radio Link (RL) is more or less the same, therefore the present invention uses signal strength signal intensity, the height that is its energy carries out the multipath selection, just select the highest footpath of energy to participate in merging, thereby can obtain maximum merging gain.
Referring to Fig. 3, in implementation method of the present invention, it is as follows at first to carry out the flow process of every concrete operations step that multipath distributes with the sub-district principle:
(1) at first from separate the path transfer set, selects a demodulating unit;
(2) do you judge that this demodulating unit just locks in the footpath of demodulation? if the footpath non-locking of this demodulating unit institute demodulation then carries out (3) operating procedure; If this footpath locks, then carry out (4) operating procedure;
(3) in search footpath set, judge whether to comprise this demodulating unit just in the footpath of demodulation? if do not comprise this footpath, then carry out (5) operating procedure; If comprise this footpath, then carry out (6) operating procedure;
(4) to separating at present in the path transfer set, judge that it is by unique demodulating unit trace demodulation just in the footpath of demodulation? if a plurality of demodulating units are arranged in this same footpath of trace demodulation, then carry out (7) operating procedure; Otherwise carry out (10) operating procedure;
(5) demodulating unit of this losing lock is set to " free time ", carries out trace demodulation so that reassign a new footpath for the demodulating unit of this losing lock, and the indication of the zero clearing of this losing lock demodulating unit simultaneously is set to 1, the expression zero clearing; And be set at 0 o'clock, represent not zero clearing (back is as the same to being provided with of demodulating unit);
(6) keep this demodulating unit, it is original just in the footpath of demodulation to allow this demodulating unit continue tracking, carries out (10) operating procedure afterwards;
(7) do you judge that the signal energy of this demodulating unit is for the strongest? if energy is the strongest, carry out (8) operating procedure; Otherwise, carry out (9) operating procedure;
(8) keep the strongest demodulating unit of this energy and carry out trace demodulation, and each demodulating unit in other the same footpath of demodulation all is set to " free time ", these zero clearing indications that are set to the demodulating unit of " free time " simultaneously are set to 1; Carry out (10) operating procedure afterwards;
(9) this demodulating unit is set to " free time ", and this zero clearing indication that is set to the demodulating unit of " free time " simultaneously is set to 1; Carry out (10) operating procedure afterwards;
(10) judge whether other demodulating units in addition? if have, carry out (11) operating procedure; If no, carry out (12) operating procedure;
(11) select next demodulating unit, promptly turn back to (2) operating procedure;
(12) enter (two) step of balanced apportion design.
Referring to Fig. 4, in implementation method of the present invention, wherein the flow process of carrying out every concrete operations step that multipath distributes with the energy principle was as follows (two) step:
(20) at first in the set of search footpath, select the strongest footpath of energy, be referred to as footpath to be allocated;
(21) judged whether this footpath to be allocated of demodulating unit demodulation? if have, then enter (22) operating procedure; If no, then enter (24) operating procedure;
(22) in the set of search footpath, judge whether to also have other footpaths not to be assigned with? if have, then enter (23) operating procedure; If no, then footpath distribution this time finishes;
(23) in the set of search footpath, select an energy time strong footpath, turn back to (21) operating procedure;
(24) judge whether to have the demodulating unit that is in " free time " state? if have, then enter (25) operating procedure; If no, then enter (26) operating procedure;
(25) this footpath to be allocated in distribution one " free time " demodulating unit trace demodulation search footpath set, and its " free time " state is set to " busy ", the footpath energy of this demodulating unit is set to the energy in this footpath to be allocated simultaneously, enters (22) operating procedure;
(26) do you judge whether all footpaths all belong to same sub-district in this footpath to be allocated and the set of search footpath? if belong to same sub-district, then enter (27) operating procedure; If not belonging to same sub-district, then enter (29) operating procedure;
(27) is the energy of judging this footpath to be allocated greater than 2 times of the current energy of separating the most weak footpath in the path transfer set? if greater than 2 times, then enter (28) operating procedure; If be not more than 2 times, then finish operation this time;
(28) will be just demodulation the demodulating unit in weak footpath distribute to this footpath to be allocated, and the footpath energy of this demodulating unit is set to the energy in this footpath to be allocated, carries out (22) operating procedure afterwards;
(29) in separating the path transfer set, select the most weak footpath of demodulating unit energy, carry out (30) operating procedure afterwards;
(30) do you judge that this footpath to be allocated belongs to same sub-district with the most weak footpath? if belong to same sub-district, enter (31) operating procedure; If do not belong to same sub-district, enter (33) operating procedure;
(31) is the energy of judging this footpath to be allocated greater than 2 times of the current energy of separating the most weak footpath in the path transfer set? if greater than 2 times, then enter (32) operating procedure; If be not more than 2 times, then enter (37) operating procedure;
(32) this demodulating unit is distributed to this footpath to be allocated, the footpath energy of this demodulating unit is set to the energy in this footpath to be allocated simultaneously, enters (22) operating procedure;
(33) do you judge that the most weak footpath separate in the path transfer set is that this sub-district unique separates path transfer? if the unique solution path transfer then enters (37) operating procedure; If not the unique solution path transfer, then enter (34) operating procedure;
(34) do you judge that this footpath to be allocated is arranged in the new sub-district of Active Set? if then enter (36) operating procedure; If not, then enter (35) operating procedure;
(35) is the energy of judging this footpath to be allocated greater than 2 times of the current energy of separating the most weak footpath in the path transfer set? if greater than 2 times, then enter (36) operating procedure; If be not more than 2 times, then enter (37) operating procedure;
(36) this demodulating unit is distributed to this footpath to be allocated, the footpath energy of this demodulating unit is set to the energy in footpath to be allocated simultaneously, enters (22) operating procedure;
(37) do you judge to separate in the path transfer set whether also do not carry out judgment processing in addition? if have, then enter (38) operating procedure; If no, then enter (22) operating procedure;
(38) the energy time weak demodulating unit in the path transfer set is separated in selection, enters (29) operating procedure.
Claims (4)
1, a kind of method that under soft handover and multipath transmisstion condition, realizes balanced distribution, comprise that carrying out multipath with the energy principle distributes, just guarantee the footpath of signal strength signal intensity maximum, promptly mediation participation merging is being separated in the footpath that energy is the strongest, so that can obtain maximum merging gain; It is characterized in that: this method was at first carried out multipath with the sub-district principle and is distributed carry out the multipath distribution with the energy principle before, guaranteed that all there is the tracked demodulation in demodulating unit of a footpath sub-district in each Active Set.
2, according to claim 1ly under soft handover and multipath transmisstion condition, realize balanced method of distributing, it is characterized in that: describedly carry out the operating procedure that multipath distributes with the sub-district principle and be:
(1) at first from separate the path transfer set, selects a demodulating unit;
(2) do you judge that this demodulating unit just locks in the footpath of demodulation? if the footpath non-locking of this demodulating unit institute demodulation then carries out (3) operating procedure; If this footpath locks, then carry out (4) operating procedure;
(3) in search footpath set, judge whether to comprise this demodulating unit just in the footpath of demodulation? if do not comprise this footpath, then carry out (5) operating procedure; If comprise this footpath, then carry out (6) operating procedure;
(4) to separating at present in the path transfer set, judge that it is by unique demodulating unit trace demodulation just in the footpath of demodulation? if a plurality of demodulating units are arranged in this same footpath of trace demodulation, then carry out (7) operating procedure; Otherwise carry out (10) operating procedure;
(5) demodulating unit of this losing lock is set to " free time ", carries out trace demodulation so that reassign a new footpath for the demodulating unit of this losing lock, and the indication of the zero clearing of this losing lock demodulating unit simultaneously is set to 1, carries out (10) operating procedure afterwards;
(6) keep this demodulating unit, it is original just in the footpath of demodulation to allow this demodulating unit continue tracking, carries out (10) operating procedure afterwards;
(7) do you judge that the signal energy of this demodulating unit is for the strongest? if energy is the strongest, carry out (8) operating procedure; Otherwise, carry out (9) operating procedure;
(8) keep the strongest demodulating unit of this energy and carry out trace demodulation, and each demodulating unit in other the same footpath of demodulation all is set to " free time ", these zero clearing indications that are set to the demodulating unit of " free time " simultaneously are set to 1; Carry out (10) operating procedure afterwards;
(9) this demodulating unit is set to " free time ", and this zero clearing indication that is set to the demodulating unit of " free time " simultaneously is set to 1; Carry out (10) operating procedure afterwards;
(10) judge whether other demodulating units in addition? if have, carry out (11) operating procedure; If no, carry out (12) operating procedure;
(11) select next demodulating unit, promptly turn back to (2) operating procedure;
(12) enter (two) step of balanced apportion design.
3, the method that realizes balanced distribution under soft handover and multipath transmisstion condition according to claim 2 is characterized in that: the zero clearing indication of described losing lock demodulating unit and demodulating unit is set at 1 o'clock, the expression zero clearing; Be set at 0 o'clock, represent not zero clearing.
4, according to claim 1ly under soft handover and multipath transmisstion condition, realize balanced method of distributing, it is characterized in that: describedly carry out the operating procedure that multipath distributes with the energy principle and be:
(20) at first in the set of search footpath, select the strongest footpath of energy, be referred to as footpath to be allocated;
(21) judged whether this footpath to be allocated of demodulating unit demodulation? if have, then enter (22) operating procedure; If no, then enter (24) operating procedure;
(22) in the set of search footpath, judge whether to also have other footpaths not to be assigned with? if have, then enter (23) operating procedure; If no, then footpath distribution this time finishes;
(23) in the set of search footpath, select an energy time strong footpath, turn back to (21) operating procedure;
(24) judge whether to have the demodulating unit that is in " free time " state? if have, then enter (25) operating procedure; If no, then enter (26) operating procedure;
(25) this footpath to be allocated in distribution one " free time " demodulating unit trace demodulation search footpath set, and its " free time " state is set to " busy ", the footpath energy of this demodulating unit is set to the energy in this footpath to be allocated simultaneously, enters (22) operating procedure;
(26) do you judge whether all footpaths all belong to same sub-district in this footpath to be allocated and the set of search footpath? if belong to same sub-district, then enter (27) operating procedure; If not belonging to same sub-district, then enter (29) operating procedure;
(27) is the energy of judging this footpath to be allocated greater than 2 times of the current energy of separating the most weak footpath in the path transfer set? if greater than 2 times, then enter (28) operating procedure; If be not more than 2 times, then finish operation this time;
(28) will be just demodulation the demodulating unit in weak footpath distribute to this footpath to be allocated, and the footpath energy of this demodulating unit is set to the energy in this footpath to be allocated, carries out (22) operating procedure afterwards;
(29) in separating the path transfer set, select the most weak footpath of demodulating unit energy, carry out (30) operating procedure afterwards;
(30) do you judge that this footpath to be allocated belongs to same sub-district with the most weak footpath? if belong to same sub-district, enter (31) operating procedure; If do not belong to same sub-district, enter (33) operating procedure;
(31) is the energy of judging this footpath to be allocated greater than 2 times of the current energy of separating the most weak footpath in the path transfer set? if greater than 2 times, then enter (32) operating procedure; If be not more than 2 times, then enter (37) operating procedure;
(32) this demodulating unit is distributed to this footpath to be allocated, the footpath energy of this demodulating unit is set to the energy in this footpath to be allocated simultaneously, enters (22) operating procedure;
(33) do you judge that the most weak footpath separate in the path transfer set is that this sub-district unique separates path transfer? if the unique solution path transfer then enters (37) operating procedure; If not the unique solution path transfer, then enter (34) operating procedure;
(34) do you judge that this footpath to be allocated is arranged in the new sub-district of Active Set? if then enter (36) operating procedure; If not, then enter (35) operating procedure;
(35) is the energy of judging this footpath to be allocated greater than 2 times of the current energy of separating the most weak footpath in the path transfer set? if greater than 2 times, then enter (36) operating procedure; If be not more than 2 times, then enter (37) operating procedure;
(36) this demodulating unit is distributed to this footpath to be allocated, the footpath energy of this demodulating unit is set to the energy in footpath to be allocated simultaneously, enters (22) operating procedure;
(37) do you judge to separate whether also have other footpaths also not carry out judgment processing in the path transfer set? if have, then enter (38) operating procedure; If no, then enter (22) operating procedure;
(38) the energy time weak demodulating unit in the path transfer set is separated in selection, enters (29) operating procedure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021036284A CN1175607C (en) | 2002-01-31 | 2002-01-31 | Method for carrying out equalized allocation under conditions of soft witching and multipath transmission |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021036284A CN1175607C (en) | 2002-01-31 | 2002-01-31 | Method for carrying out equalized allocation under conditions of soft witching and multipath transmission |
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| Publication Number | Publication Date |
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| CN1435962A CN1435962A (en) | 2003-08-13 |
| CN1175607C true CN1175607C (en) | 2004-11-10 |
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| CNB021036284A Expired - Lifetime CN1175607C (en) | 2002-01-31 | 2002-01-31 | Method for carrying out equalized allocation under conditions of soft witching and multipath transmission |
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