CN102123510B - Base station device - Google Patents
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- CN102123510B CN102123510B CN2011100567583A CN201110056758A CN102123510B CN 102123510 B CN102123510 B CN 102123510B CN 2011100567583 A CN2011100567583 A CN 2011100567583A CN 201110056758 A CN201110056758 A CN 201110056758A CN 102123510 B CN102123510 B CN 102123510B
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Abstract
The invention discloses a base station device. Through the base station device, more than one and less than M sub-channels can be applied to the wireless communication with a wireless terminal in the capacity range of the wireless terminal correspondingly in a first modulation mode capable of performing high-speed wireless communication and a second modulation mode capable of performing low-speed wireless communication. A wireless base station is characterized by comprising a judging part and a notification part, wherein the judging part is used for selecting a second combination when a necessary sending output of the second combination is smaller than a necessary sending output of a first combination under the condition that both the first combination and the second combination meet a required communication speed; the first combination consists of the first modulation mode and the number N of the sub-channels, the second combination consists of the second modulation mode and the number N' of the sub-channels, N is more than or equal to 1 and less than or equal to M, and N' is more than or equal to 1 and less than or equal to M; and the notification part notifies the selected combination to the wireless terminal.
Description
The application is to be on September 29th, 2006 applying date, and application number is 200680055958.4, and denomination of invention is divided an application for the application for a patent for invention of " base station apparatus ".
Technical field
The present invention relates to a kind of channel allocation method; As OFDMA (Orthogonal Frequency DivisionMultiplexing Acces); Is the band segmentation of using in a plurality of subchannels and the communication mode to 1 above subchannel of a plurality of mobile radio stations distribution; Power consumption with expanding communication zone, raising message capacity and reduction mobile radio station is a purpose, carries out subchannel according to wireless environment (communication environments of radio wave), specification and the request communication speed of each mobile radio station and distributes.
Background technology
In the ofdma communication mode, in down link, the base station is used and is all utilized frequency band to the concurrent feed signals of a plurality of mobile radio station allocated sub-channels.
On the other hand, in up link, the mobile radio station utilization sends signal for the subchannel of each mobile radio station and the modulation system and the encoding rate of appointment by base station assigns.
Mobile radio station can improve power spectral density through transmitted power only being concentrated in the subchannel frequency band that is distributed, the expanding communication zone.But, owing to having reduced number of sub-channels, having dwindled the subchannel frequency band, so cause telex network speed to descend.
In the past, proposed to come allocated sub-channels (frequency bandwidth) (for example patent documentation 1) according to the related communication request of mobile radio station.But, in the prior art of patent documentation 1 record, confirm the frequency bandwidth that mobile radio station uses by system, so that optimize remaining bandwidth available.That is, purpose is to stay the more operable frequency bandwidth of other mobile radio stations.Therefore, in the prior art, fail to accomplish effectively to apply flexibly utilizable resource, the communication speed of the mobile radio station in failing to realize communicating by letter improves and power consumption reduces.
Patent documentation 1: Japan special table 2003-513588 communique
Patent documentation 2: TOHKEMY 2003-18117 communique
Patent documentation 3: TOHKEMY 2004-214746 communique
In HSDPA communication modes such as (High Speed Downlink Packet Access), adopt the adaptive modulation system that changes modulation system according to wireless environment.But in these adaptive modulation systems, frequency bandwidth is certain, so do not consider the influence that the increase and decrease of transmit power spectral density caused because of the change frequency bandwidth.
Even in the ofdma communication mode, under the situation that reduces number of sub-channels and fixed allocation number of sub-channels, also still can the expanding communication zone.But, in this case,, also can only improve communication speed through the change modulation system even when near the wireless environment that the base station, waits is good.
Not only changing modulation system, also dynamically changing under the situation of number of sub-channels, expectation can expanding communication zone and improve communication speed.But, owing to must suitably carry out the distribution of modulation system and number of sub-channels, so the distribution method that will look for novelty.
For example; Distribution at subchannel is improper; It is under the situation of the subchannel more than the necessary degree that mobile radio station has been distributed modulation system and encoding rate with respect to appointment; To cause descending, can not satisfy modulation system and the needed communication quality of encoding rate to the base station appointment from the power spectral density that mobile radio station sends.On the contrary, when having distributed fewer number of sub-channels, can not realize the largest user communication speed that can realize originally.
Therefore, need to consider the radio propagation environment of mobile radio station and the maximum transmit power of mobile radio station, dynamically distribute suitable modulating mode and encoding rate and number of sub-channels.
Summary of the invention
The objective of the invention is to, a kind of technology that can realize based on the communication speed raising of modulation system and subchannel distribution is provided.And, can the expanding communication zone.
And; Other purposes of the present invention are; Provide a kind of the transmitted power of the communication request of mobile radio station and mobile radio station as determinating reference, through selecting suitable modulating mode, encoding rate and number of sub-channels, can improve communication speed, reduce the technology of the transmitted power of mobile radio station.
In order to achieve the above object, the present invention adopts following means.Promptly; The present invention provides a kind of base station apparatus, and it distributes the subchannel more than 1 to mobile radio station, the radio communication of carrying out up direction through this subchannel and mobile radio station more than 1; This base station apparatus comprises: estimating section, and it estimates the communication environments of the radio wave from the mobile radio station to the base station; The interference volume calculating part, its received power according to the base station is calculated interference volume; And definite portion; It is according to the specification condition of said communication environments, said interference volume and said mobile radio station; Confirm modulation system, encoding rate and number of sub-channels that said mobile radio station use when send the base station, so that these information of confirming are notified to said mobile radio station.
Preferred definite portion of the present invention confirms to satisfy modulation system, encoding rate and the number of sub-channels of the communication request condition in the transmission of said mobile radio station.
Preferred definite portion of the present invention confirms to satisfy modulation system, encoding rate and the number of sub-channels of the request communication quality of being asked according to said interference volume, said communication request condition and said specification condition.
The combination that constitutes by a plurality of modulation systems and encoding rate that preferred specification condition of the present invention comprises that said mobile radio station can use; Said definite portion is according to said communication environments and said interference volume; To said each combination that constitutes by a plurality of modulation systems and encoding rate; The number of sub-channels of described request communication quality is satisfied in calculating, according to the combination that is made up of a plurality of modulation systems, encoding rate and number of sub-channels of being calculated, confirms notify a combination to said mobile radio station.
Transmitted power during combination in the said combination that is made up of a plurality of modulation systems, encoding rate and number of sub-channels that preferred base station apparatus computing application of the present invention is confirmed by said definite portion is given said mobile radio station with its notice.
Preferred definite portion of the present invention confirms to satisfy the described request communication quality, and communication speed is a combination in the maximum said combination that is made up of a plurality of modulation systems, encoding rate and number of sub-channels.
Preferred definite portion of the present invention confirms to satisfy the described request communication quality, and the transmitted power of said mobile radio station is one in the minimum said combination that is made up of a plurality of modulation systems, encoding rate and number of sub-channels.
Preferred definite portion of the present invention is according to a plurality of determinating references with priority, confirms in the said combination that is made up of a plurality of modulation systems, encoding rate and number of sub-channels.During this situation, preferred additional priority of giving said a plurality of determinating references is by dynamically change.
A plurality of determinating references for example are at least two in " maximization of communication speed ", " observing of request communication speed ", " the minimizing of transmitted power " and " maximum quantity of the subchannel that can use ".
The confirming of preferred modulation system of the present invention, encoding rate and number of sub-channels carried out according to the cycle.
And; The present invention provides a kind of wireless base station, its with the 1st modulation system that can carry out high-speed radiocommunication with can carry out the 2nd modulation system that low-speed wireless communicates by letter accordingly, with more than 1 and the subchannel below M is used in the limit of power of wireless terminal, and this wireless terminal between the radio communication of carrying out; Said wireless base station is characterised in that; Said wireless base station has: detection unit, and it all satisfies under the situation of needed communication speed in the 1st combination and the 2nd combination, when necessity transmission output of the 2nd combination is sent output less than necessity of the 1st combination; Select the 2nd combination; Wherein, the 1st combination by said the 1st modulation system and number of sub-channels N (1≤N≤M) constitute, the 2nd combination is by the 2nd modulation system and number of sub-channels the N ' (formation of 1≤N≤M); And notice portion, it notifies this combination of selecting to this wireless terminal.
The combination that preferred said detection unit is selected is in the combination that constitutes of modulation system and the number of sub-channels by the communication speed that satisfies said needs, send the combination that is output as minimum.
And; The present invention provides a kind of wireless base station, its with the 1st modulation system that can carry out high-speed radiocommunication with can carry out the 2nd modulation system that low-speed wireless communicates by letter accordingly, with more than 1 and the subchannel below M is used in the limit of power of wireless terminal, and this wireless terminal between the radio communication of carrying out; Said wireless base station is characterised in that; Said wireless base station has: detection unit, and its transmission output in the 1st combination and the 2nd combination is under the situation below the predetermined transmission output, when the communication speed of the 2nd combination is faster than the communication speed of the 1st combination; Select the 2nd combination; Wherein, the 1st combination by said the 1st modulation system and number of sub-channels N (1≤N≤M) constitute, the 2nd combination is by the 2nd modulation system and number of sub-channels the N ' (formation of 1≤N≤M); And notice portion, it notifies this combination of selecting to this wireless terminal.
The combination that preferred said detection unit is selected is in the combination that is made up of modulation system below the said predetermined transmission output and number of sub-channels, communication speed is the combination of maximum.
According to the present invention, can realize improving based on the communication speed of modulation system and subchannel distribution.
And,, as determinating reference,, can improve the transmitted power of communication speed, reduction mobile radio station to the transmitted power of the communication request of mobile radio station and mobile radio station through selecting suitable modulating mode, encoding rate and number of sub-channels according to the present invention.
Description of drawings
Fig. 1 is the figure that expression realizes an execution mode of mobile radio station of the present invention.
Fig. 2 is the figure that expression realizes an execution mode of base station of the present invention.
Fig. 3 is the figure of concrete example of the information of explanation mobile radio station report.
The figure of the concrete example of Fig. 4 modulation system that to be explanation calculated by the present invention and encoding rate and allocated sub-channels quantity.
Fig. 5 be expression according to the propagation loss (distance) of mobile radio station and base station but the allocated sub-channels quantity that changes and the figure of transmitted power.
The figure at Fig. 6 covering edge that to be expression change according to modulation system and encoding rate and allocated sub-channels quantity.
Fig. 7 is the flow chart that the action example of modulation system of the present invention and encoding rate and allocated sub-channels quantity is confirmed in expression.
Label declaration
10 mobile radio stations (terminal installation); 11 acceptance divisions; The 11A reception antenna; 12 sending parts; The 12A transmitting antenna; 13 determination parts; 14 control parts; 20 base station apparatus; 21 acceptance divisions; The 21A reception antenna; 22 sending parts; The 22A transmitting antenna; 23 received power determination parts; 24 storage device portions; 25 propagation loss calculating parts; 26 interference volume calculating parts; 27 allocated sub-channels quantity calculating parts; 28 determinating reference selection portions; 29 allocated sub-channels detection units; 30 control parts.
Embodiment
Below, with reference to description of drawings execution mode of the present invention.The structure of execution mode only is an example, the invention is not restricted to the structure of execution mode.
(overview of execution mode)
In this execution mode, use following means to select suitable modulating mode and encoding rate and number of sub-channels.The execution mode (topology example) of the base station apparatus (polynary connected system) that the execution mode (topology example) of the mobile radio station (terminal installation) that Fig. 1 representes to the present invention relates to, Fig. 2 are represented to the present invention relates to.
(1) the communication capacity report information of mobile radio station 10 with modulation system that mobile radio station can be used in up link and encoding rate and maximum transmit power etc. given the unit (sending part) 12 of base station.Base station apparatus (base station) 20 has storage device portion 24, modulation system and encoding rate and maximum transmit power that the mobile radio station 10 that its preservation is reported by mobile radio station 10 can use.
(2) base station 20 has the unit (sending part 22) that the shared signal of being informed is sent to the whole mobile radio stations 10 that are positioned at communication zone (sub-district).Mobile radio station 10 has: the determination part 13 of measuring the received power of the shared signal of being informed by base station 20; With the unit (sending part 12) that the shared signal received power of being measured is reported to base station 20.Base station 20 has loss calculating part (propagation loss calculating part 25), and it calculates the total losses (radio propagation environment) between mobile radio station 10 and the base station 20 according to the shared signal transmitted power of being sent by the shared signal received power and the base station 20 of mobile radio station 10 reports.
(3) base station 20 has: the received power determination part (determination part 23) of measuring total received power; With the interference calculation portion (interference volume calculating part 26) of calculating interference power (interference volume) according to the total received power of base station.
(4) base station 20 has allocated sub-channels quantity calculating part 27; It is according to based on the total losses of being calculated, interference power (interference volume), based on the signal to noise ratio (SINR:Signal-to-Interference.and Noise power Ratio) of being asked (confirming) by the maximum transmit power of mobile radio station 10 reports and each modulation system and the encoding rate that can use, the combination of the whole number of sub-channels that calculate each modulation system that can tackle to mobile radio station 10 and encoding rate, can distribute, the transmitted power of needed mobile radio station and the communication speed of estimation when using this number of sub-channels.
(5) mobile radio station 10 has when communicating through up link, will comprise that the access request of the communication request condition (communication speed or the traffic) that is directed against the base station is notified the unit to base station 20 (sending part 12).Base station 20 has determinating reference selection portion 28, and it is according to the communication request condition of mobile radio station 10 and the resource of base station 20, the determinating reference that uses when being chosen in the modulation system of confirming to distribute to mobile radio station 10 and encoding rate and number of sub-channels.
(6) base station 20 has allocated sub-channels detection unit 29, and it confirms modulation system and encoding rate and allocated sub-channels quantity that mobile radio station 10 uses according to the determinating reference that is provided by determinating reference selection portion 28.
(7) base station 20 has modulation system, encoding rate, number of sub-channels and transmitted power that mobile radio station 10 is used and notifies the unit to mobile radio station 10 (sending part 22).Mobile radio station 10 has the unit (sending part 12) that sends signal according to the modulation system of being notified, encoding rate, number of sub-channels and transmitted power to base station 20.
(effect)
(1) mobile radio station 10 comprises modulation system, encoding rate and the maximum transmit power Tx that mobile radio station 10 can be tackled to base station (network) transmission when getting into network
MaxAbility information report.Base station 20 receives this report and is kept in the storage device portion 24.
(2) mobile radio station 10 is in order to estimate the communication environments of the radio wave between base station 20 and the mobile radio station 10; The received power of mensuration shared signal of 20 transmissions from the base station; When in up link, communicating, received power is measured the result report to base station 20 with the request communication speed.Report when maximum transmit power can be with these information of same.
When (3) base station 20 receives the communication request (received power of shared signal is measured result and communication request condition (communication speed, maximum transmit power)) in the up link of mobile radio station 10; Measure the result and from the shared signal transmitted power of base station 20, the total losses Lp between calculation base station 20 and the mobile radio station 10 according to received power.And; The mensuration result of interference power (interference volume) Io in the 20 use base stations 20, base station, the request communication quality SINRj that in the combination j that maximum transmit power, modulation system and encoding rate by mobile radio station 10 constitute, asks; Formula 1 and formula 2 below utilizing are calculated whole number of sub-channels Nj that in the combination j that is made up of each modulation system and encoding rate, can distribute, the transmitted power Txj (Nj) of needed mobile radio station 10 and the communication speed Thj (Nj) of estimation when using each number of sub-channels Nj.
Tx
j(N
j)=N
j* SINR
j* L
p* I
o(≤Tx
Max) ... (formula 1)
Th
j(N
j)=N
j* Th_sub
j... (formula 2)
In formula 2, Th_sub
jCommunication speed during use 1 subchannel when refer to using the combination j that constitutes by modulation system and encoding rate.
Thus, can obtain the combination that constitutes by the modulation system, encoding rate and the number of sub-channels that satisfy the request communication quality.Can from resulting single or a plurality of combinations, select to compare the current combination of expanding communication zone.Selected combination is given mobile radio station 10 by notice, and mobile radio station 10 uses and is somebody's turn to do combination, thereby can under the state that satisfies the request communication quality, realize the communication zone expansion based on the subchannel distribution.
(4) number of sub-channels (number of sub-channels under the unused state) that can use according to the request communication speed and the base station of mobile radio station 10 of base station 20 etc. selects to be used for to confirm the determinating reference of the combination that modulation system, encoding rate and the number of sub-channels that should be used by mobile radio station 10 constitute.
As determinating reference, can stipulate " maximization of communication speed ", " observing of request communication speed ", " minimizing of transmitted power " and " maximum quantity of available subchannels " etc.Can adopt any 1 structure of only using in these determinating references.Perhaps, also can adopt following structure, select any more than two in these determinating references,, select a combination according to priority to the additional priority of selected plural determinating reference.
(5) base station 20 is according to determinating reference, combination J and allocated sub-channels quantity N that modulation system of confirming should to be used by mobile radio station 10 and encoding rate constitute
J(in the combination that constitutes by modulation system, encoding rate and number of sub-channels one), with this combination and when being suitable for this combination for satisfying the transmitted power Tx of communication quality needs
J(N
J) notify and give mobile radio station 10.
For example; Priority at determinating reference for example is under the situation about stipulating according to the order of " observing of request communication speed ", " minimizing of transmitted power "; According to the 1st priority, from the combination that constitutes by a plurality of modulation systems, encoding rate and number of sub-channels, select (extraction) to satisfy the combination of request communication speed.At this moment, when having extracted a plurality of combination, according to the 2nd priority, selecting transmitted power is minimum combination.
(6) mobile radio station 10 uses by the combination of base station 20 notices (the combination J, the number of sub-channels N that are made up of modulation system and encoding rate
J), according to the transmitted power Tx that is notified
J(N
J) communicate.
(7) because the communication environments time to time change, so the distribution of modulation system, encoding rate and number of sub-channels that mobile radio station 10 uses is carried out in base station 20 regular (according to the cycle) in up link.
(concrete condition of execution mode)
Fig. 1 is the figure that expression realizes the execution mode of mobile radio station of the present invention.In Fig. 1, mobile radio station 10 has the acceptance division 11 that connects reception antenna 11A, sending part 12, determination part 13 and the control part 14 that connects transmitting antenna 12A.
In Fig. 1, mobile radio station 10 receives from the base station 20 shared signals that send via reception antenna 11A through acceptance division 11 when communicating through up link, measure the received power of shared signals at determination part 13.The mensuration result of received power offers sending part 12.Control part 14 will comprise that according to receiving signal the specification condition (modulation system that can use and encoding rate etc.) of mobile radio station 10 and the transmission signal (ability information of mobile radio station (wireless terminal)) of communication request condition (communication speed, maximum transmit power etc.) offer sending part 12.Sending part 12 will comprise that the report of received power mensuration result and specification condition and communication request condition sends to base station 20.
Fig. 3 representes the report example of mobile radio station 10 (mobile radio station # 1).Mobile radio station 10 sends the report that comprises communication speed, maximum transmit power, modulation system and encoding rate and wireless environment (received power of shared signal is measured the result) to base station 20.
Fig. 2 is the figure that expression realizes the execution mode of base station of the present invention.In Fig. 2, base station 20 has the acceptance division 21 that connects reception antenna 21A, sending part 22, received power determination part 23, storage device portion 24, propagation loss calculating part 25, interference volume calculating part 26, allocated sub-channels quantity calculating part 27, decision condition selection portion 28, allocated sub-channels detection unit 29 and the control part 30 that connects transmitting antenna 22A.
In addition, propagation loss calculating part 25 is equivalent to estimating section of the present invention, and allocated sub-channels quantity calculating part 27 is equivalent to definite portion of the present invention with allocated sub-channels detection unit 29.
The uplink requests (access request) that base station 20 receives from mobile radio station 10 at acceptance division 21 through reception antenna 21A.Uplink requests comprises above-mentioned report (Fig. 3).
Report (modulation system and encoding rate, communication speed, shared signal received power etc.) is stored in the storage device portion 24.And propagation loss calculating part 25 is obtained the total losses Lp (being equivalent to communication environments) between mobile radio station 10 and the base station 20 according to the received power mensuration result who comprises in the report and the shared signal transmitted power of base station 20.The received power (total received power) that base station 20 is measured from the reception signal (uplink requests) of mobile radio station 10 at received power determination part 23 is measured (calculating) at interference volume calculating part 26 and is measured result's's (total received power) interference power Io based on this.
And, the maximum transmit power Tx that base station 20 is used total losses Lp, the interference power Io that is measured and reported by mobile radio station 10 (terminal)
Max(being stored in the storage device portion 24), through allocated sub-channels quantity calculating part 27 calculate for the combination j that constitutes by each modulation system and encoding rate, satisfy the number of sub-channels Nj of request communication quality (SINR) and maximum transmit power, the transmitted power Tx of needed mobile radio station 10 when each number of sub-channels of application Nj
j(N
j) and the communication speed Th that estimates
j(N
j).Allocated sub-channels quantity calculating part 27 is calculating transmitted power Tx
j(N
j) and communication speed Th
j(N
j) time use above-mentioned (formula 1) and (formula 2).
Fig. 4 is expression number of sub-channels N
j, transmitted power Tx
j(N
j) and communication speed Th
j(N
j) the table of result of calculation example.But; In Fig. 4, for the purpose of simplifying the description, only be defined as { QPSK1/2 to the combination j that constitutes by modulation system and encoding rate; 16QAM1/2; These three kinds of 64QAM1/2}, can being assumed to be 5 subchannel to the maximum number of sub-channels that mobile radio station 10 distributes, the communication speed (Th_sub when calculating use 1 subchannel of using when estimating communication speed
j) be made as { 0.2Mbps, 0.4Mbps, 0.6Mbps} respectively.
In addition, though the communication speed when using 1 subchannel according to condition and difference, the ratio (1: 2: 3) in the combination that three kinds of using in the example are made up of modulation system and encoding rate is certain.According to table shown in Figure 4, through using by modulation system that satisfies the request communication quality and combination J and the allocated sub-channels quantity N that encoding rate constitutes
J(in the combination that is made up of modulation system, encoding rate and number of sub-channels one) can be satisfied the communication quality of being asked, and realize the expansion of communication zone.
Specifically, result of calculation shown in Figure 4 is from allocated sub-channels quantity calculating part 27 input allocated sub-channels detection units 29.Allocated sub-channels detection unit 29 is according to the determinating reference of being selected by determinating reference selection portion 28 more than 1 (alternative condition of the combination that is made up of modulation system, encoding rate and number of sub-channels), the combination that selection (confirming) mobile radio station 10 should use from result of calculation (j, Nj).Determined combination and necessary transmitted power Tx
J(N
J) offer sending part 22 together, comprise that their transmission signal sends to mobile radio station 10 from transmitting antenna 22A.
In addition, classification, classification number, the additional priority to each determinating reference of the determinating reference of being selected by determinating reference selection portion 28 for example can suitably change through the control of control part 30.Estimate communication speed Th
j(N
j) be used for when using the determinating reference relevant with communication speed reference and make up definite.And when the application determinating reference " can use number of sub-channels ", this " can use number of sub-channels " increased and decreased according to the untapped number of sub-channels of base station 20.
The action of allocated sub-channels detection unit 29 more specifically is described.
Wireless base station among Fig. 2 corresponding to the 1st modulation system that can carry out high-speed radiocommunication (for example 16QAM) with can carry out the 2nd modulation system (for example QPSK) that low-speed wireless is communicated by letter, with more than 1 and the subchannel of (M is 5 in the example in front) below the M be used in the limit of power of wireless terminal (mobile radio station) and the radio communication between the mobile radio station.
With reference to Fig. 4, be 10.5 if the reception quality of signals of mobile radio station is SINR, then can use the arbitrary side among the 1st modulation system 16QAM and the 2nd modulation system QPSK.And, suppose that needed communication speed is 0.8 [Mbps-], according to Fig. 4, the combination of number of sub-channels 2～5 when number of sub-channels 4,5, modulation system 16QAM in the time of can selecting modulation mode QPSK.
When this compared sending output, when 16QAM, number of sub-channels 2 exported 15.51 for sending, and when QPSK, number of sub-channels 4 is for sending output 13.02, and necessary transmission output is little.
Therefore, allocated sub-channels detection unit 29 is controlled to be chooser channel quantity 4 when QPSK, gives mobile radio station with selection result from sending part 22 notices.
Like this, under the situation that can select modulation system more at a high speed as modulation system, increase number of sub-channels, select the more modulation system of low speed as modulation system, the result can suppress the transmission output of mobile radio station low.
And, send in the combination of number of sub-channels 2～5 when number of sub-channels 4,5, modulation system QAM during preferred selecting modulation mode QPSK and be output as minimum channel (QPSK is a number of sub-channels 4) here, realize sending minimizing of output.That is, use minimum transmission output as decision condition.
And, can send the transmission output capping (for example 16dBm) of output etc. to the maximum of mobile radio station, therefrom select the combination that constitutes by modulation system, number of sub-channels.
Identical with the front; When SINR is 10.5dB; During modulation system QPSK when number of sub-channels 1～5, modulation system 16QAM number of sub-channels 1 or 2 satisfy the conditions of sending output, but the number of sub-channels 1 or 2 when comparing 16QAM, the communication speed of the number of sub-channels 5 during QPSK is faster.Therefore, detection unit 29 is controlled to be the combination of the number of sub-channels 5 when selecting QPSK, and gives mobile radio station with selection result from sending part 22 notices.
Like this, under the situation that can select more modulation system at a high speed as modulation system, increase number of sub-channels, select the more modulation system of low speed as modulation system, the result can accelerate the communication speed of mobile radio station.
And, during preferred selecting modulation mode QPSK when number of sub-channels 1～5, modulation system 16QAM in the combination of number of sub-channels 1,2 communication speed be maximum channel (QPSK is a number of sub-channels 5) here, realize the maximization of communication speed.That is, use the highest communication speed as decision condition.Fig. 5 schematically represent number of sub-channels that base station 20 and the distance (total losses Lp) between the mobile radio station 10 when using a modulation system change, with the relation of the transmitted power of the mobile radio station 10 of asking at this moment.As shown in Figure 5, along with the reduced distances (total losses diminish) between base station 20 and the mobile radio station 10,, also can satisfy the communication quality of being asked even increase number of sub-channels.Therefore, according to the result of calculation of total losses,, can realize that communication speed improves through in the scope that satisfies the request communication quality, increasing number of sub-channels.
For example; As determinating reference use " can use subchannel (maximum 4) ", " observing of request communication speed " reaches " minimizing of transmitted power "; When having added priority according to the order of " can use subchannel (maximum 4) ", " observing of request communication speed ", " minimizing of transmitted power "; In the result of calculation of Fig. 4, be combined as " (16QAM1/2) * 3 subchannel ", " (16QAM1/2) * 4 subchannel ", " (64QAM1/2) * 2 subchannel ", " (64QAM1/2) * 3 subchannel " these 4 by what the modulation system that satisfies communication request condition (communication speed, maximum transmit power), encoding rate and number of sub-channels constituted.Wherein the minimum combination of transmitted power is " (16QAM1/2) * 3 subchannel ", and this combination is assigned to mobile radio station #1 (mobile radio station 10).
By contrast; As determinating reference use " can use subchannel (maximum 5) ", " maximization of communication speed " reaches " minimizing of transmitted power "; When having added priority according to the order of " can use subchannel (maximum 5) ", " maximization of communication speed ", " minimizing of transmitted power "; In the result of calculation of Fig. 4, communication speed is " (16QAM1/2) * 5 subchannel " for maximum combination, and this combination is assigned to mobile radio station #1 (mobile radio station 10).The communication speed of this combination is also faster than the combination of using " (64QAM1/2) ", and transmitted power also diminishes.
Like this, through the change determinating reference, can through the resource (subchannel) that can use effectively apply flexibly the power consumption that suppresses mobile radio station 10, make the communication speed maximization.
Generally, communication environments follows the mobile grade of mobile radio station 10 to change along with effluxion.Therefore, the modulation system and encoding rate and the number of sub-channels that need regular (according to the cycle) distribution mobile radio station 10 in up link, to use.
Fig. 7 representes to confirm the modulation system of mobile radio station use and the motion flow of encoding rate and number of sub-channels according to execution mode of the present invention.Shown in the flow chart of Fig. 7, above-mentioned calculating and judgement are carried out according to the communication environments of mobile radio station 10 termly in base station 20, confirm modulation system and encoding rate and number of sub-channels that mobile radio station 10 should use.
Specify the flow chart of Fig. 7.Step S1 in Fig. 7, base station 20 (Fig. 2) receives the access request (uplink requests) from mobile radio station 10 through reception antenna 21A and acceptance division 21.
Before step S1, base station 20 is sent shared signal with transmitting antenna 22A to communication zone (sub-district) from sending part 22.This shared signal uses when mobile radio station 10 is measured received power.Comprise information report, that comprise received power in the access request as mobile radio station 10.
At step S2; Communication request condition (communication speed etc.), wireless environment (received power of descending shared signal etc.) and the specification condition (modulation system and encoding rate, maximum transmit power etc.) of mobile radio station 10 discerned according to the report that comprises in the access request in base station 20.This processing is for example undertaken by control part 30, is used for confirming decision condition (determinating reference).
At step S3, propagation loss calculating part 25 uses the wireless environment (received power of descending shared signal etc.) of mobile radio station 10, calculates the total losses Lp between mobile radio station 10 and the base station 20.
At step S4, by disturbance state (interference volume) Io of determination part 23 and interference volume calculating part 26 mensuration base stations.Then; Allocated sub-channels quantity calculating part 27 calculates corresponding allocated sub-channels quantity Nj, the necessary transmitted power Tx of each combination j that constitutes with the modulation system that can be used by mobile radio station 10 and encoding rate according to specification condition, the interference volume Io of base station 20, the total losses Lp of mobile radio station 10
j(N
j), estimate communication speed Th
j(N
j).But, when not using the determinating reference relevant, also can omit the calculating of estimating communication speed as determinating reference with communication speed.
At step S5; Allocated sub-channels detection unit 29 is according to the determinating reference of being selected by determinating reference selection portion 28 more than 1; From the combination that constitutes by modulation system, encoding rate and allocated sub-channels quantity of calculating by allocated sub-channels quantity calculating part 27; Selection should be distributed to the combination of mobile radio station 10, and uses sending part 22 and transmitting antenna 22A to send.Thus, comprise the signal of modulation system, encoding rate and number of sub-channels that mobile radio station 10 should use in uplink communication, notified to mobile radio station 10.
At step S6, the signal that mobile radio station 10 (Fig. 1) receives from the downlink communication of base station 20 at acceptance division 11.The reception signal that receives at acceptance division 11 is provided for control part 14.Control part 14 control sending parts 12 are so that according to modulation system, encoding rate and number of sub-channels by base station 20 notices, carry out uplink communication.
Then, through behind the certain hour, modulation system, encoding rate and the number of sub-channels corresponding with the situation of mobile radio station 10 are notified in the processing of execution in step S2～S5 once more in base station 20.
In the example depicted in fig. 7; Identical during with the access request of mobile radio station 10; Use is according to the base station 20 of mensuration result's calculating of mobile radio station and the propagation loss between the mobile radio station 10; But owing to be in the communication, so number of sub-channels and the transmitted power that also can use when the communication according to the accepting state (SINR) of the communication sub-channels of base station, mobile radio station are calculated allocated sub-channels quantity and the necessary transmitted power corresponding with each modulation system and encoding rate.
(effect)
According to the embodiment of the present invention; According to the interference volume of the propagation loss between mobile radio station 10 and the base station 20, base station 20 and the maximum transmit power of mobile radio station 10; Dynamically select modulation system that (confirming) will use and encoding rate, allocated sub-channels quantity; Can satisfy the communication quality of being asked thus, realize that the expansion and the communication speed that cover the edge improve.
And, according to the embodiment of the present invention, can effectively apply flexibly the resource (subchannel) that can use, the power consumption that reduces mobile radio station reaches the interference to peripheral base station.
In addition; In this execution mode; Explained and adopted as modulation system in the communication system of OFDM (OFDM), through distributing the subchannel of any amount to realize the polynary connection communication system (base station) of the polynary connection of frequency division (FDMA) each user (mobile radio station).But the mode that the present invention relates to also can be applied to adopt the system of adaptive modulation system beyond the OFDMA, variable frequency range width, transmission power control.
Claims (4)
1. wireless base station; Its with the 1st modulation system that can carry out high-speed radiocommunication with can carry out the 2nd modulation system that low-speed wireless communicates by letter accordingly; With more than 1 and the subchannel below the M is used in the limit of power of wireless terminal, and this wireless terminal between the radio communication of carrying out
Said wireless base station is characterised in that,
Said wireless base station has:
Detection unit, it all satisfies under the situation of needed communication speed in the 1st combination and the 2nd combination, the necessary transmitted power of the 2nd combination less than the 1st make up necessary transmitted power the time; Select the 2nd combination, wherein, the 1st combination is made up of said the 1st modulation system and number of sub-channels N; The 2nd combination is made up of the 2nd modulation system and number of sub-channels N '; Wherein, 1 ≦ N ≦ M, and 1 ≦ N ’ ≦ M; And
Notice portion, it notifies this combination of selecting to this wireless terminal.
2. wireless base station according to claim 1 is characterized in that, the combination that said detection unit is selected is in the combination that constitutes of modulation system and the number of sub-channels by the communication speed that satisfies said needs, transmitted power is the combination of minimum.
3. wireless base station; Its with the 1st modulation system that can carry out high-speed radiocommunication with can carry out the 2nd modulation system that low-speed wireless communicates by letter accordingly; With more than 1 and the subchannel below the M is used in the limit of power of wireless terminal, and this wireless terminal between the radio communication of carrying out
Said wireless base station is characterised in that,
Said wireless base station has:
Detection unit, its transmitted power in the 1st combination and the 2nd combination is under the situation below the predetermined transmitted power, when the communication speed of the 2nd combination is faster than the communication speed of the 1st combination; Select the 2nd combination, wherein, the 1st combination is made up of said the 1st modulation system and number of sub-channels N; The 2nd combination is made up of the 2nd modulation system and number of sub-channels N '; Wherein, 1 ≦ N ≦ M, and 1 ≦ N ’ ≦ M; And
Notice portion, it notifies this combination of selecting to this wireless terminal.
4. wireless base station according to claim 3 is characterized in that, the combination that said detection unit is selected is in the combination that is made up of modulation system below the said predetermined transmitted power and number of sub-channels, communication speed is the combination of maximum.
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| CN1830161A (en) * | 2003-08-06 | 2006-09-06 | 松下电器产业株式会社 | Radio communication device and radio communication method |
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| CN1830161A (en) * | 2003-08-06 | 2006-09-06 | 松下电器产业株式会社 | Radio communication device and radio communication method |
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| Title |
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| JP特开2005-12321A 2005.01.13 |
| JP特开平10-247955A 1998.09.14 |
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