CN101895921B - Method for selecting coordinated multipoint cell - Google Patents
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- CN101895921B CN101895921B CN200910084639A CN200910084639A CN101895921B CN 101895921 B CN101895921 B CN 101895921B CN 200910084639 A CN200910084639 A CN 200910084639A CN 200910084639 A CN200910084639 A CN 200910084639A CN 101895921 B CN101895921 B CN 101895921B
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Abstract
The invention discloses a method for selecting a coordinated multipoint CoMP cell. The method comprises the following steps of: presetting a threshold of the CoMP cell, selecting an ENB which meets the threshold of the CoMP cell as a candidate ENB from an adjacent base station ENB by user equipment (UE), and reporting the ENB to a main ENB. Through the method, the conditions of participating in the CoMP cell are definitely defined, so that the UE selects the ENB which meets the threshold of the CoMP cell from the adjacent ENBs; therefore, the receiving quality of users on the cell edge is optimized, and the spectral efficiency of the system edge is improved.
Description
Technical field
The present invention relates to the evolution version LTE-Advanced technology of long-term evolution plan (LTE, Long Term Evolved), the method for particularly a kind of selecting coordinated multiple spot (CoMP, CoordinativeMultiple Point) sub-district.
Background technology
The LTE-Advanced technology is as 3rd Generation Partnership Project (3GPP; 3rdGeneration Partnership Project) technology that develops in follow-up radio communication; The integrated communications field advanced signal processing technology in the last few years; For example, OFDM (OFDM, OrthogonalFrequency Division Multiplexing) technology, import more and export more (MIMO; Multi-inputand Multi-output) technology, adaptive technique etc. have improved capacity, spectrum efficiency and the coverage of wireless communication system greatly.
For the intrasystem user of LTE-Advanced, in radio communication, possibly be in the center of sub-district (sector), also possibly be in the edge of sub-district.When the user is in center of housing estate; Because the LTE-Advanced system does not have the inner OFDM of the employing technology of processing gain and sub-district, makes the user can not receive the interference of this community user, in addition; Interference source distance users from outer sub-district is also distant; Thereby user's reception is good, and the spectrum efficiency of system is higher, and capacity is bigger; But when the user is in cell edge,, influenced user's reception, caused system ovelay range minimizing, edge spectrum efficiency to reduce owing to the interference and the transmission link mis-behave of outer sub-district.
In order to solve interference of users in cell edges, improve the edge spectrum efficiency of system and the reception of edge customer, prior art has proposed the technical scheme of CoMP cell transmission; Briefly be described below: subscriber equipment (UE, User Equipment) judging under the bad situation of the quality of reception, around this UE of picked at random two or three adjacent cells or base station (ENB; Evolved Node B) as candidate CoMP sub-district; Report the current affiliated main ENB of UE, main ENB is according to certain resource distribution strategy, for example; Adopt the effective SIR mapping of index (EESM; Exponential Effective SIRMapping) method is chosen the CoMP sub-district from the candidate CoMP sub-district that UE reports, utilize the unification of CoMP sub-district to be the Cell Edge User transmission signals; Thereby to Cell Edge User service manner is provided jointly through the CoMP sub-district; Utilize space resources and improve the communication quality of Cell Edge User, realize not only eliminating interference, but also enhanced system coverage, improve the purpose of edge spectrum efficiency simultaneously.
By above-mentioned visible; The technical scheme of existing C oMP cell transmission, around this UE of UE picked at random two or three adjacent cells are as candidate CoMP sub-district, though the power of adjacent cell is strong, relative time delay is less; Help improving the quality of reception of Cell Edge User; But because adjacent cell is picked at random, possibly exist the better adjacent cell of channel circumstance not have the selected candidate of being CoMP sub-district, make that adjacent cell as the CoMP sub-district is not that power is the strongest, relative time delay minimum adjacent cell; Thereby influenced the quality of reception of Cell Edge User, the system edges spectrum efficiency is descended.
Summary of the invention
In view of this, a main purpose of the present invention is to provide a kind of CoMP of choosing method of sub-district, optimizes the quality of reception of Cell Edge User, the edge spectrum efficiency of raising system.
For achieving the above object, the invention provides the method for a kind of selecting coordinated multiple spot CoMP sub-district, this method comprises:
CoMP sub-district threshold value is set in advance;
User equipment (UE) from adjacent base station ENB, choose satisfy CoMP sub-district threshold value ENB as candidate ENB, report to main ENB.
Said CoMP sub-district threshold value comprises: relative time delay threshold value and Reference Signal Received Power RSRP threshold value.
Said user equipment (UE) is chosen the ENB that satisfies CoMP sub-district threshold value and is comprised from adjacent base station ENB:
Said UE chooses the ENB that satisfies said RSRP threshold value from said adjacent ENB, from the ENB of the said RSRP of satisfying threshold value, choose the ENB that satisfies threshold value in said relative time delay again, perhaps,
Said UE chooses the ENB that satisfies threshold value in said relative time delay from said adjacent ENB, from the said ENB that satisfies the threshold value in relative time delay, choose the ENB that satisfies said RSRP threshold value again.
Said UE chooses the ENB that satisfies said RSRP threshold value and comprises from said adjacent ENB:
Measure adjacent ENB in the RSRP at UE place value;
Obtain main ENB in the RSRP at UE place value;
Calculate adjacent ENB at the RSRP at UE place value and main ENB relative mistake in the RSRP at UE place value;
Choose the adjacent ENB that relative mistake is not more than said RSRP threshold value.
The said ENB that satisfies threshold value in said relative time delay that from the ENB of the said RSRP of satisfying threshold value, chooses comprises:
The relative mistake that said UE measurement is chosen is not more than the ENB and the corresponding timing advance TA of main ENB of said RSRP threshold value;
Obtaining said relative mistake, to be not more than the relative timing lead of the corresponding TA of the ENB of the said RSRP threshold value TA corresponding with main ENB poor;
Choose the ENB that said relative timing lead difference is not more than threshold value in said relative time delay.
After choosing the ENB that said relative timing lead difference is not more than threshold value in said relative time delay, report to before the main ENB, this method further comprises: the ENB that satisfies the threshold value in relative time delay that will select is stored in the ENB candidate list;
Maximum TA among the ENB that preserves in A, the said candidate list of calculating and the difference of minimum TA;
B, judge maximum TA and minimum TA difference whether greater than threshold value in said relative time delay, if steps A is returned in the then less ENB deletion of RSRP value among the ENB that maximum TA is corresponding with minimum TA from candidate list; Otherwise the ENB in the said candidate list as candidate ENB, is carried out the said operation that reports to main ENB.
Said UE chooses the ENB that satisfies threshold value in said relative time delay and comprises from said adjacent ENB:
Said UE measures adjacent ENB and the corresponding timing advance TA of main ENB;
The relative timing lead that obtains the corresponding TA of the said adjacent ENB TA corresponding with main ENB is poor;
Choose the ENB that said relative timing lead difference is not more than threshold value in said relative time delay.
After choosing the ENB that said relative timing lead difference is not more than threshold value in said relative time delay, report to before the main ENB, this method further comprises: the ENB that satisfies the threshold value in relative time delay that will select is stored in the ENB candidate list;
Maximum TA among the ENB that preserves in C, the said candidate list of calculating and the difference of minimum TA;
D, judge maximum TA and minimum TA difference whether greater than threshold value in said relative time delay, if, then calculate the said maximum TA ENB corresponding respectively in the RSRP at UE place value with minimum TA, step C is returned in ENB deletion that less RSRP value is corresponding from candidate list; Otherwise the ENB in the said candidate list as candidate ENB, is carried out the said operation that reports to main ENB.
Saidly from the said ENB that satisfies the threshold value in relative time delay, choose the ENB that satisfies said RSRP threshold value and comprise:
Obtain main ENB at the RSRP at UE place value RSRP
Max
Calculate adjacent ENB at the RSRP at UE place value and main ENB relative mistake Δ RSRP in the RSRP at UE place value
i
Choose the ENB that relative mistake is not more than said RSRP threshold value.
Said relative time delay, threshold value was the time span of Cyclic Prefix, perhaps, and the time span of Cyclic Prefix and a product less than one coefficient.
Visible by above-mentioned technical scheme; The method of selecting coordinated multiple spot CoMP provided by the invention sub-district, through CoMP sub-district threshold value is set in advance, UE from adjacent ENB, choose satisfy CoMP sub-district threshold value ENB as candidate ENB; Report to main ENB; Because the condition of CoMP participating sub-district is carried out clear and definite definition, make UE from adjacent ENB, choose the ENB that satisfies CoMP sub-district threshold value, can so that choose that the ENB that reports is that power is the strongest, relative time delay minimum ENB; Thereby optimized the quality of reception of Cell Edge User, improved the system edges spectrum efficiency.
Description of drawings
Fig. 1 chooses the method flow sketch map of CoMP sub-district for the present invention;
Fig. 2 chooses the schematic flow sheet of the ENB that satisfies the RSRP threshold value from adjacent ENB for the present invention;
Fig. 3 chooses the schematic flow sheet of the ENB that satisfies the threshold value in relative time delay from the ENB that satisfies the RSRP threshold value for the present invention;
Fig. 4 chooses another schematic flow sheet of the ENB that satisfies CoMP sub-district threshold value from adjacent ENB for UE of the present invention.
Embodiment
For making the object of the invention, technical scheme and advantage clearer, will combine accompanying drawing and specific embodiment that the present invention is done to describe in detail further below.
The method of choosing the CoMP sub-district provided by the invention; Condition through to the CoMP participating sub-district is carried out clear and definite definition; UE chooses the adjacent cell (ENB) that meets CoMP sub-district condition from adjacent cell (ENB); Reporting main ENB then, at last confirm the CoMP sub-district of actual participation by main ENB according to certain resource distribution strategy, below is that example describes to choose the ENB that meets CoMP sub-district condition.
Fig. 1 chooses the method flow sketch map of CoMP sub-district for the present invention, and referring to Fig. 1, this flow process comprises:
In this step; The CoMP sub-district threshold value that is provided with in advance can be each adjacent ENB of reflection the relative time delay at UE place threshold value and ENB at the Reference Signal Received Power (RSRP at UE place; ReferenceSignal Received Power) threshold value; Also can be relative time delay threshold value and ENB in Reference Signal Received Quality (RSRQ, the Reference Signal Received Quality) threshold value at UE place, can also be ENB receives index at other of UE place.
In the practical application, CoMP sub-district threshold value can be arranged among the UE in advance, also can be provided with by network center, is issued among the corresponding UE through main ENB then, and in flow, can upgrades the CoMP sub-district threshold value that is provided with.
In describing below, with CoMP sub-district threshold value be relative time delay threshold value and the RSRP threshold value be that example describes.For CoMP sub-district threshold value is threshold value and the situation of RSRQ threshold value in relative time delay; Because the RSRQ threshold value just is different threshold value indexs with the RSRP threshold value; It is identical with the flow process of from the adjacent ENB that satisfies the RSRP threshold value, choosing the CoMP sub-district from the adjacent ENB that satisfies the RSRQ threshold value, to choose the flow process of CoMP sub-district, follow-up repeating no more.
For the LTE-Advanced system that adopts the OFDM technology, because OFDM is divided into many orthogonal sub-channels at frequency domain with channel, the intercarrier of each subchannel keeps quadrature, and frequency spectrum is overlapped, has so just reduced the interference between subchannel, has improved the availability of frequency spectrum.Thereby the LTE-Advanced system is very responsive to frequency shift (FS), and very little frequency shift (FS) all possibly destroy the orthogonality between subcarrier, thereby produces inter-carrier interference (ICI, Inter-Carrier Interference); In addition, when the multipath signal time delay was big, the time delay diffusion of last symbol will constitute intersymbol interference (ISI to next symbol; Inter-symbol Interference), for fear of ICI and ISI, through serial data stream being modulated on the parallel subcarrier; (CP CyclePrefix), promptly protects at interval in the data flow transmitted code word, to insert simultaneously Cyclic Prefix; Through adding Cyclic Prefix, can prevent that a number of sub-carrier and another subcarrier from obscuring the ICI of generation mutually; Simultaneously; When the time span of the CP that is inserted greater than multipath in during the maximum delay expansion; Because the buffer action of CP, the multipath signal time delay is during less than the time span of CP, and the time delay of last symbol is diffused in the time span of a CP by complete attenuation; Thereby can not constitute intersymbol interference, eliminate ISI effectively next symbol.
In the present embodiment, be destroyed the ICI that causes for fear of the orthogonality between the ISI that causes owing to the CP multipath delay and each subcarrier, can relative time delay threshold value be set to the time span τ of CP
CPWith a product smaller or equal to 1 positive coefficient, promptly relative time delay threshold value=α τ
CP, 0＜α≤1.Wherein, the time span τ of CP
CPCan be referring to related protocol, for example, for the CP that does not have expansion, τ
CP=4.6875 (us) are for the CP of expansion, τ
CP=16.67 (us).
When the ENB that chooses satisfies relative time delay during threshold value, can be so that the ENB that chooses be minimum relative time delay, thus more effectively eliminate the problem of ISI and ICI.
The signal power of RSRP threshold value reflection ENB, when the ENB that chooses satisfied the RSRP threshold value that is provided with, can guarantee to choose the ENB that reports was the stronger ENB of power among the adjacent ENB, thereby can optimize the quality of reception of Cell Edge User.
In this step; If CoMP sub-district threshold value is a threshold value and RSRP threshold value in aforesaid relative time delay; Then UE at first chooses the ENB that satisfies the threshold value in relative time delay from adjacent ENB; From the ENB that satisfies the threshold value in relative time delay, choose the ENB that satisfies the RSRP threshold value again, the ENB that satisfies the RSRP threshold value that will choose then reports to main ENB as candidate ENB; Perhaps, UE at first chooses the ENB that satisfies the RSRP threshold value from adjacent ENB, from the ENB that satisfies the RSRP threshold value, chooses the ENB that satisfies the threshold value in relative time delay again, and the ENB that satisfies the threshold value in relative time delay that will choose then reports to main ENB as candidate ENB.
UE chooses the ENB that satisfies CoMP sub-district threshold value from adjacent ENB schematic flow sheet as shown in Figures 2 and 3.
Specifically, Fig. 2 is the present invention chooses the ENB that satisfies the RSRP threshold value from adjacent ENB a schematic flow sheet, and referring to Fig. 2, this flow process comprises:
In this step, i ENB is designated as RSRP in the RSRP at UE place value
i, concrete method of measurement can repeat no more at this referring to pertinent literature.
Step 202 is obtained main ENB at the RSRP at UE place value RSRP
Max
In this step, the main ENB that obtains is generally the maximum in all RSRP values in the RSRP at UE place value, is designated as RSRP
Max
Step 203 is calculated adjacent each ENB at the RSRP at UE place value and the main ENB relative mistake Δ RSRP in the RSRP at UE place value
i
In this step, calculate i ENB at UE place and RSRP
MaxThe relative mistake formula be:
ΔRSRP
i＝RSRP
max-RSRP
i
Step 204 is chosen the ENB that satisfies the RSRP threshold value.
In this step, if Δ RSRP
i＜RSRP
Threshold, then this ENB is the ENB that satisfies the RSRP threshold value, in the formula, and RSRP
ThresholdBe the RSRP threshold value that is provided with in advance.
In the practical application, RSRP
ThresholdSetting and diversity gain, algorithm design are relevant, for example, and for existing LTE-Advanced system, RSRP
ThresholdValue can be set to below the 8dB.
Fig. 3 is the present invention chooses the ENB that satisfies the threshold value in relative time delay from the ENB that satisfies the RSRP threshold value a schematic flow sheet, and referring to Fig. 3, this flow process comprises:
In this step, the TA that UE measures ENB belongs to prior art, repeats no more at this, and i the corresponding Timing Advance of adjacent ENB is designated as TA
iThe corresponding Timing Advance of self owner ENB of institute is designated as TA
Base
Step 302 is obtained the relative timing lead difference Δ TA of the corresponding Timing Advance of each the adjacent ENB Timing Advance corresponding with main ENB
i
In this step, relative timing lead difference Δ TA
iComputing formula be:
ΔTA
i＝TA
i-TA
base。
Step 303 is chosen the ENB that satisfies the threshold value in relative time delay;
In this step, the formula of choosing the ENB that satisfies the threshold value in relative time delay is:
ΔTA
i≤τ
CP
In the formula, τ
CPBe the threshold value in relative time delay.
In the practical application, UE chooses the ENB that satisfies the threshold value in relative time delay from the ENB that satisfies the RSRP threshold value after, promptly after the execution in step 303, can report to main ENB with this ENB that satisfies the threshold value in relative time delay that chooses as candidate ENB; Perhaps; For making the CoMP sub-district that reports can be more accurate; Guarantee less overhead, can also the ENB that satisfy the threshold value in relative time delay be stored in the ENB candidate list and to the ENB that satisfies the threshold value in relative time delay that this is chosen and do further to select, be i.e. execution in step 304～step 305.Particularly,
In this step, among the ENB that preserves in the candidate list, the maximum timing lead is designated as Δ TA
Max, the minimum timing lead is designated as Δ TA
Min
In follow-up, main ENB receives the CoMP sub-district that reports, and confirms the CoMP sub-district of actual participation according to certain resource distribution strategy, and is identical with prior art, repeats no more at this.
Fig. 4 is UE of the present invention chooses the ENB that satisfies CoMP sub-district threshold value from adjacent ENB another schematic flow sheet, and referring to Fig. 4, this flow process comprises:
Step 401, UE measures each adjacent ENB and the corresponding TA of main ENB;
Step 402 is obtained the relative timing lead difference Δ TA of the corresponding Timing Advance of each the adjacent ENB Timing Advance corresponding with main ENB
i
Step 403 is chosen the ENB that satisfies the threshold value in relative time delay;
In the practical application, after UE chooses the ENB that satisfies the threshold value in relative time delay, can, this choose the ENB that satisfies the RSRP threshold value, execution in step 405 from satisfying the ENB of threshold value in relative time delay; Perhaps; For making the CoMP sub-district that reports can be more accurate, guarantee less overhead, can also the ENB that satisfy the threshold value in relative time delay be stored in the ENB candidate list; And this ENB that satisfies the threshold value in relative time delay made further to select i.e. execution in step 404a～step 404b.Particularly,
Step 404a, among the ENB that preserves in the calculated candidate tabulation, the maximum timing lead that each ENB is corresponding and the difference of minimum timing lead;
Step 404b; Whether the difference of judging maximum timing lead and minimum timing lead is greater than the threshold value in relative time delay; If; Then calculate the maximum timing lead ENB corresponding with the minimum timing lead respectively in the RSRP at UE place value, the ENB that less RSRP value is corresponding deletes from candidate list, again execution in step 404a; If not, execution in step 405.
Step 405 among the ENB from the candidate list that step 403 or step 404b obtain, is measured adjacent each ENB in the RSRP at UE place value;
Step 406 is obtained main ENB at the RSRP at UE place value RSRP
Max
Step 407 is calculated adjacent each ENB at the RSRP at UE place value and the main ENB relative mistake Δ RSRP in the RSRP at UE place value
i
Step 408 is chosen the ENB that satisfies the RSRP threshold value.
In this step, if Δ RSRP
i＜RSRP
Threshold, then this ENB is the ENB that satisfies the RSRP threshold value, and all ENB that satisfy the RSRP threshold value in the candidate list as candidate ENB, are reported to main ENB, in the formula, and RSRP
ThresoldBe the RSRP threshold value that is provided with in advance.
Visible by the foregoing description, the method for choosing the CoMP sub-district provided by the invention is through be provided with CoMP sub-district threshold value in advance; UE chooses the ENB that satisfies CoMP sub-district threshold value from adjacent ENB, report to main ENB, is confirmed the CoMP sub-district of actual participation according to certain resource distribution strategy by main ENB; Because the condition of CoMP participating sub-district is carried out clear and definite definition; Make UE from adjacent ENB, choose the ENB that satisfies CoMP sub-district threshold value, choose the ENB that reports and be that power is the strongest, relative time delay minimum ENB, thereby guarantee under the prerequisite of less overhead; Optimize the quality of reception of Cell Edge User, improved the system edges spectrum efficiency.
More than lift preferred embodiment; The object of the invention, technical scheme and advantage have been carried out further explain, and institute it should be understood that the above is merely preferred embodiment of the present invention; Not in order to restriction the present invention; All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. the method for a selecting coordinated multiple spot CoMP sub-district is characterized in that this method comprises:
CoMP sub-district threshold value is set in advance;
User equipment (UE) from adjacent base station ENB, choose satisfy CoMP sub-district threshold value ENB as candidate ENB, report to main ENB;
Said CoMP sub-district threshold value comprises: relative time delay threshold value and Reference Signal Received Power RSRP threshold value, said user equipment (UE) is chosen the ENB that satisfies CoMP sub-district threshold value and is comprised from adjacent base station ENB:
Said UE chooses the ENB that satisfies said RSRP threshold value from said adjacent ENB, from the ENB of the said RSRP of satisfying threshold value, choose the ENB that satisfies threshold value in said relative time delay again, perhaps,
Said UE chooses the ENB that satisfies threshold value in said relative time delay from said adjacent ENB, from the said ENB that satisfies the threshold value in relative time delay, choose the ENB that satisfies said RSRP threshold value again;
Said UE chooses the ENB that satisfies said RSRP threshold value and comprises from said adjacent ENB:
Measure adjacent ENB in the RSRP at UE place value;
Obtain main ENB in the RSRP at UE place value;
Calculate adjacent ENB at the RSRP at UE place value and main ENB relative mistake in the RSRP at UE place value;
Choose the adjacent ENB that relative mistake is not more than said RSRP threshold value;
The said ENB that satisfies threshold value in said relative time delay that from the ENB of the said RSRP of satisfying threshold value, chooses comprises:
The relative mistake that said UE measurement is chosen is not more than the ENB and the corresponding timing advance TA of main ENB of said RSRP threshold value;
Obtaining said relative mistake, to be not more than the relative timing lead of the corresponding TA of the ENB of the said RSRP threshold value TA corresponding with main ENB poor;
Choose the ENB that said relative timing lead difference is not more than threshold value in said relative time delay;
Said UE chooses the ENB that satisfies threshold value in said relative time delay and comprises from said adjacent ENB:
Said UE measures adjacent ENB and the corresponding timing advance TA of main ENB;
The relative timing lead that obtains the corresponding TA of the said adjacent ENB TA corresponding with main ENB is poor;
Choose the ENB that said relative timing lead difference is not more than threshold value in said relative time delay;
Saidly from the said ENB that satisfies the threshold value in relative time delay, choose the ENB that satisfies said RSRP threshold value and comprise:
Obtain main ENB at the RSRP at UE place value RSRP
Max
Calculate adjacent ENB at the RSRP at UE place value and main ENB relative mistake Δ RSRP in the RSRP at UE place value
i
Choose the ENB that relative mistake is not more than said RSRP threshold value.
2. the method for claim 1 is characterized in that, to be not more than the relative timing lead of the corresponding TA of the ENB of the said RSRP threshold value TA corresponding with main ENB poor obtaining said relative mistake; Choose after the ENB that said relative timing lead difference is not more than threshold value in said relative time delay, report to before the main ENB, this method further comprises: the ENB that satisfies the threshold value in relative time delay that will select is stored in the ENB candidate list;
Maximum TA among the ENB that preserves in A, the said candidate list of calculating and the difference of minimum TA;
B, judge maximum TA and minimum TA difference whether greater than threshold value in said relative time delay, if steps A is returned in the then less ENB deletion of RSRP value among the ENB that maximum TA is corresponding with minimum TA from candidate list; Otherwise the ENB in the said candidate list as candidate ENB, is carried out the said operation that reports to main ENB.
3. the method for claim 1 is characterized in that, and is poor at the relative timing lead that obtains the corresponding TA of the said adjacent ENB TA corresponding with main ENB; Choose after the ENB that said relative timing lead difference is not more than threshold value in said relative time delay, report to before the main ENB, this method further comprises: the ENB that satisfies the threshold value in relative time delay that will select is stored in the ENB candidate list;
Maximum TA among the ENB that preserves in C, the said candidate list of calculating and the difference of minimum TA;
D, judge maximum TA and minimum TA difference whether greater than threshold value in said relative time delay, if, then calculate the said maximum TA ENB corresponding respectively in the RSRP at UE place value with minimum TA, step C is returned in ENB deletion that less RSRP value is corresponding from candidate list; Otherwise the ENB in the said candidate list as candidate ENB, is carried out the said operation that reports to main ENB.
4. like each described method of claim 1 to 3, it is characterized in that said relative time delay, threshold value was the time span of Cyclic Prefix, perhaps, the time span of Cyclic Prefix and a product less than one coefficient.
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| CN1856168A (en) * | 2005-04-19 | 2006-11-01 | Lg电子株式会社 | Idle mode handoff in a mobile communications system |
| CN1694565A (en) * | 2005-05-20 | 2005-11-09 | 上海贝豪通讯电子有限公司 | Method of switching in TD-SCDMA communication system |
| EP1835682A2 (en) * | 2006-03-17 | 2007-09-19 | Samsung Electronics Co., Ltd. | Apparatus and method for selecting modulation and filter roll-off to meet power and bandwidth requirements |
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