CN101594684A - Base station and wireless communications method - Google Patents
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Abstract
The invention provides a kind of base station and wireless communications method.Described base station uses OFDMA system and one or more terminal equipment to carry out radio communication, and have: channel-assignment unit, divide extra channel that is used in data communication and the anchor channel that comprises in being mapped in to PRU, the position that is assigned with the PRU of described extra channel has been indicated in described mapping, wherein, described channel-assignment unit is given the PRU in preset frequency territory with described anchor channel allocation, and described additional channel assignment is given the PRU in the territory different with described preset frequency territory.
Description
The cross reference of related application
The application requires the Japanese patent application 2008-138472 that submits on May 27th, 2008 and the priority of the Japanese patent application 2008-138473 that submits on May 27th, 2008, and its whole disclosures are incorporated into herein for your guidance.
Technical field
The present invention relates to a kind of base station and a kind of wireless communications method, can use the OFDMA system to carry out radio communication.
Background technology
In recent years, become universal, allowed the user to make a call at any time and any place and acquired information by the terminal equipment of representatives such as PHS (personal handyphone system), mobile phone.Especially, recently because the available information amount has shown stable growth, thus introduced at a high speed and high-quality wireless communication system to realize download to mass data.
In such radio communication, need carry out duplex transmission/reception to signal.The duplex mode of system typically can comprise by the TDD (time division duplex) of time division way switching transmission/reception and the FDD (Frequency Division Duplexing (FDD)) that uses different frequency transmission/reception to be carried out duplex operation.In addition, allow typically can comprise: the TDMA (time division multiple access) that switches a plurality of terminal equipments by time division way with the multi-address system that a plurality of terminal equipments are communicated by letter simultaneously; The FDMA of divided band (frequency division multiple access); And the CDMA of the distinct symbols of multiplexing each terminal equipment (code division multiple access).
For example, PHS communication standard of future generation at high-speed digital communication can comprise ARIB (association of radio industrie and business) STD T95 (non-patent literature 1) and PHS MoU (memorandum of understanding), and they have adopted OFDMA/TDMA TDD BWA (of future generation PHS system).
OFDMA (OFDM) is meant that the multiple access among the OFDM (OFDM) inserts.OFDM is the Advanced Edition of FDM (frequency division multiplexing), be a kind of effective system of service band in the following manner: on frequency axis, carrier signal is divided into a plurality of subcarriers, and make the quadrature in phase of signal wave between the adjacent sub-carrier, thereby make the frequency band of subcarrier partly overlapping.When a terminal equipment had taken among the OFDM all subcarriers, OFDMA was by making up a plurality of (for example 24) subcarrier to form subchannel, and allowed multiple access to insert by share all subchannels between a plurality of terminal equipments.For example, subchannel becomes 20 sub-frequency bands with the 18MHz frequency band division.
Simultaneously, except that OFDMA, PHS of future generation system also allows the multiple access of TDMA mode to insert.TDMA be a kind of on time shaft, frequency partition become a plurality of time slots and with the system that communicates in many ways.Under present circumstances, suppose up link (from terminal to base station) and down link (from the base station to the terminal) are divided into four sublinks respectively.In other words, in PHS of future generation system, frequency axis and time shaft can be divided into communication block again, wherein, give a plurality of terminal equipments with these communication block dynamic assignment, thereby allow to communicate by letter efficiently.A defined communication block of time slot in subchannel is known as PRU (physical resource unit), and 80 PRU are used in supposition in a base station adjacent domain.In addition, a defined communication block of time slot in subchannel is known as PRU (physical resource unit), and supposes that each base station uses 36 to 40 PRU.
As mentioned above, in the time of can using 20 subchannels in the base station, one in these subchannels as control channel (CCH), and gives terminal equipment (dynamic channel allocation (DCA)) with all the other subchannel dynamic assignment.The PRU that comprises to the subchannel that is used for communicating by letter anchor channel (anchor channel) or additional channel assignment.Distribute an anchor channel to each terminal equipment, the anchor channel comprises the mapping that is assigned with the PRU of terminal equipment extra channel.This extra channel is the actual channel that comprises data, and, according to data volume and communication conditions, give a terminal equipment with a plurality of additional channel assignment.The mapping that comprises in the anchor channel is known as " FM pattern " (based on quick access channel of mapped mode) to the notice that extra channel is distributed in the same manner.
The anchor channel allocation is given the PRU that when all PRU are carried out carrier sense, finds with optimal communication quality.Although extra channel is not carried out carrier sense basically,, then after carrying out carrier sense, give PRU with additional channel assignment if the PRU that does not communicate has newly been used in its base station.In this manner, because the base station can change the position and the number of extra channel by anchor dynamics of channels ground, thereby can send/receive mass data at a high speed.
Yet the PRU in the OFDMA system exists and may produce the problem of disturbing with adjacent PRU.Multiple technologies have been proposed to avoid this interference with radio communication.For example, patent documentation 1 discloses a kind of technology, wherein, descending chain circuit frame is divided into the Resource Block of similar size, transmit data from the section start scheduling of each Resource Block, and will exceed of the ending place transmission of the data dispatch of resource block capacity at the Resource Block of distributing to other sectors.This technology has been set forth and can have been prevented to communicate continuously in the cochannel sector and reduce cochannel and disturb.
In addition, the PRU in the OFDMA system exist may with produce the problem of disturbing along the adjacent PRU of frequency direction.Multiple technologies have been proposed to avoid this interference with radio communication.For example, patent documentation 1 discloses a kind of technology, wherein, descending chain circuit frame is divided into the Resource Block of similar size, transmit data from the section start scheduling of each Resource Block, and will exceed of the ending place transmission of the data dispatch of resource block capacity at the Resource Block of distributing to other sectors.This technology has been set forth can prevent to have in the cochannel sector and has lingeringly been communicated and reduce cochannel and disturb.
[patent documentation 1] JP-T-2006-515141 (translator of Japanese of the announcement of " JP-T " as used herein expression PCT patent application).
[non-patent literature 1] ARIB (association of radio industrie and business) STD-T95.
Summary of the invention
As mentioned above, OFDMA/TDMA TDD system can use than more attaching terminal equipment of above-mentioned TDMA-TDD (user) and more communication block (PRU) and communicate.Yet, since each terminal equipment may have different communication conditions and with the different distance of base station, and correspondingly have different modulation schemes, power and delay, thereby may disturb between the adjacent PRU.For delay, in TDMA, guiding frequency band (guideband) can prevent to disturb effectively.Yet, in OFDMA because the band overlapping of subcarrier, if thereby PRU on modulation scheme or power, differ widely, PRU may be subjected to the influence of the electric wave of adjacent PRU.
If in extra channel, detect the mistake that causes by any interference, then can compensate extra channel by the repeat requests of sending as ARQ (repeat requests automatically) or HARQ (mixing automatic repeat requests) and so on.Yet, because the anchor channel comprises about the number of extra channel and the information of position (mapping), if thereby can not use the anchor channel owing to the interference of other PRU, communication itself can not be carried out.
On the other hand, as mentioned above, the anchor channel is carried out distribution by carrying out carrier sense, and before communication was cut off, the position of the PRU of anchor channel can not change.Therefore, although can determine the existence with the interference of predetermined PRU, can't determine that frame after next moment regularly locates the existence with the interference of predetermined PRU at the time point place that carries out carrier sense.Correspondingly, even the communication conditions that is assigned with the PRU of anchor channel worsens in communication period, also can not overcome this deterioration.
For example, since dynamic assignment extra channel, thereby have certain situation, wherein after the result based on carrier sense distributes the anchor channel, the additional channel assignment of different terminal equipment is given the PRU of adjacent with the anchor channel (particularly adjacent) along the frequency axis direction.Especially, when extra channel was used high power modulating system (for example, 256QAM (quadrature amplitude modulation)), the anchor channel was subjected to the interference of the extra channel of other-end equipment, thereby possibly can't communicate.
Consider the problems referred to above, the purpose of this invention is to provide a kind of base station and a kind of wireless communications method, can be under the minimum situation in interference-limited, carry out stable communicating by letter by considering to be assigned with the position of the PRU of an employed anchor channel of terminal equipment and extra channel with the anchor channel.
In addition, another object of the present invention provides a kind of base station and a kind of wireless communications method, can will be under the minimum situation, carry out stable communication by considering to be assigned with the position of the PRU of an employed extra channel of terminal equipment to the interference-limited of anchor channel.
According to a first aspect of the invention, provide a kind of OFDMA of use system and one or more terminal equipments to carry out the base station of radio communication, described base station comprises: channel-assignment unit, divide extra channel that is used in data communication and the anchor channel that comprises in being mapped in to PRU, the position that is assigned with the PRU of described extra channel has been indicated in described mapping, wherein, described channel-assignment unit is given the PRU in preset frequency territory with described anchor channel allocation, and described additional channel assignment is given the PRU in the territory different with described preset frequency territory.
According to above-mentioned configuration, owing to only the anchor channel allocation is given the PRU in preset frequency territory, thereby can be definitely distinguish being assigned with the frequency domain of the PRU of this anchor channel and the frequency domain that is assigned with the PRU of extra channel.Correspondingly, owing to after having distributed the anchor channel, do not give the PRU adjacent with this anchor channel with the additional channel assignment of different terminal equipment, thereby can prevent the interference of extra channel to the anchor channel.This has improved communication stability.
According to a second aspect of the invention, described preset frequency territory be assigned with the frequency domain of control channel adjacent.
Because control channel is indexing transfer, thereby between the transmission of the transmission of control channel and next control channel, this control channel does not communicate.Correspondingly, PRU and the adjacent PRU that is assigned with control channel has lower interference.Correspondingly, according to above-mentioned configuration, can reduce the interference to the anchor channel, this has realized the raising of communication stability.
According to a third aspect of the invention we, described preset frequency territory is biased to employed highest frequency territory, base station or low-limit frequency territory.
If described preset frequency territory is set to employed intermediate frequency territory, base station, then be assigned with the interference that PRU with the anchor channel may be subjected to being assigned to the extra channel of and more low-frequency PRU higher than the preset frequency territory of this PRU.On the contrary, according to above-mentioned configuration, can be assigned with the decreased number of the adjacent PRU of the PRU of the anchor channel PRU number to the situation that is set to the intermediate frequency territory in the preset frequency territory half, thereby reduced of the interference of adjacent extra channel to the anchor channel.
According to a forth aspect of the invention, the wireless communications method of a kind of OFDMA of use system is provided, adopt one or more terminal equipments and base station, wherein, when described base station when PRU divides the extra channel be used in data communication and comprise anchor channel in being mapped in, described anchor channel allocation is given the PRU in preset frequency territory in described base station, and described additional channel assignment given and the PRU that is assigned with different territory, the described preset frequency territory of described anchor channel, the position that is assigned with the PRU of described extra channel has been indicated in wherein said mapping.
Can be applied to this wireless communications method with the corresponding assembly of technological thought in above-mentioned base station and the explanation thereof.
According to a fifth aspect of the invention, provide a kind of OFDMA of use system and one or more terminal equipments to carry out the base station of radio communication, described base station comprises: channel-assignment unit, divide extra channel that is used in data communication and the anchor channel that comprises mapping to PRU, the position that is assigned with the PRU of described extra channel has been indicated in described mapping, wherein, described channel-assignment unit will be assigned with the employed additional channel assignment of the terminal equipment of described anchor channel and give and the different PRU that are assigned with the identical time slot of PRU of described anchor channel.
According to above-mentioned configuration, will use the additional channel assignment of the terminal equipment of this anchor channel to give the PRU that is assigned with the time slot of this anchor channel.Correspondingly, do not give the PRU that is assigned with the time slot of this anchor channel with the additional channel assignment of other-end equipment.Correspondingly, can prevent of the interference of the extra channel of other-end equipment, thereby allow stable communication this anchor channel.
According to a sixth aspect of the invention, if channel-assignment unit with a plurality of anchor channel allocation give the PRU of identical time slot, then described channel-assignment unit will be assigned with the employed additional channel assignment of the terminal equipment of an anchor channel give with a described anchor channel along the adjacent PRU of frequency direction.
Because the result based on carrier sense distributes the anchor channel, thereby there is the situation of a plurality of anchor channel allocation being given identical time slot.In this case, if will use the additional channel assignment of the terminal equipment of anchor channel give with this anchor channel along the adjacent PRU of frequency direction, then can suppress interference from the extra channel of other-end equipment.
According to a seventh aspect of the invention, provide a kind of OFDMA of use system and one or more terminal equipments to carry out the base station of radio communication, described base station comprises: channel-assignment unit, divide extra channel that is used in data communication and the anchor channel that comprises mapping to PRU, the position that is assigned with the PRU of described extra channel has been indicated in described mapping, wherein, described channel-assignment unit is given an employed additional channel assignment of terminal equipment the PRU of a time slot.
According to this configuration that will use the additional channel assignment of a terminal equipment to the PRU of a time slot, because at each terminal equipment, can communicate by time division way, and the beam shaping of adaptive array antenna can suitably point to this terminal equipment, thereby can farthest obtain the effect of adaptive array antenna.
According to an eighth aspect of the invention, described channel-assignment unit is given described additional channel assignment and the PRU that is assigned with the identical time slot of the employed anchor channel of the terminal equipment of described extra channel.
Because the result based on carrier sense distributes the anchor channel, thereby there is the situation of a plurality of anchor channel allocation being given identical time slot.In this case, if will use the additional channel assignment of the terminal equipment of anchor channel give with this anchor channel along the adjacent PRU of frequency direction, then can suppress interference from the extra channel of other-end equipment.
According to a ninth aspect of the invention, at each terminal equipment, described channel-assignment unit is given the anchor channel allocation PRU of different time-gap.
According to the configuration of giving different time slots with the anchor channel allocation,, give different time slots with additional channel assignment at each terminal equipment at each terminal equipment.Correspondingly, a terminal equipment uses a time slot, can suppress the interference of the extra channel of other-end equipment to this anchor channel thus.
In addition, owing to can communicate by time division way at each terminal equipment, thereby can farthest obtain the effect of adaptive array antenna.
According to the tenth aspect of the invention, described channel-assignment unit is given the PRU adjacent or approaching with control channel with the anchor channel allocation.
Because control channel is intermittently used, thereby there is the situation that the PRU with control channel does not communicate that is assigned with.Correspondingly, owing to have low the interference with the adjacent or approaching PRU of control channel, thereby, can avoid the communication disruption that causes owing to interference with the anchor channel by giving this PRU with the anchor channel allocation.
According to an eleventh aspect of the invention, described base station also comprises adaptive array antenna.
According to a twelfth aspect of the invention, the wireless communications method of a kind of OFDMA of use system is provided, adopt one or more terminal equipments and base station, wherein, when described base station when PRU divides the extra channel be used in data communication and comprise anchor channel in being mapped in, described base station will be assigned with the employed additional channel assignment of the terminal equipment of described anchor channel and give and the different PRU that are assigned with the identical time slot of PRU of described anchor channel, and the position that is assigned with the PRU of described extra channel has been indicated in wherein said mapping.
Can be applied to this wireless communications method with the corresponding assembly of technological thought in above-mentioned base station and the explanation thereof.
According to base station of the present invention and wireless communications method, can will be under the minimum situation to the interference-limited of anchor channel, carry out stable communicating by letter by considering to be assigned with the position of the PRU of an employed anchor channel of terminal equipment and extra channel.
In above-mentioned base station of the present invention, can will be under the minimum situation to the interference-limited of anchor channel, carry out stable communication by considering to be assigned with the position of the PRU of an employed extra channel of terminal equipment.
Description of drawings
Describe schematic aspect of the present invention in detail with reference to the following drawings, in the accompanying drawings:
Fig. 1 shows the schematic diagram of the annexation between the assembly that comprises in the wireless communication system;
Fig. 2 shows the block diagram of the overall arrangement of base station;
Fig. 3 A and 3B are the views that is used for explaining at the frame structure of the data of the radio communication transmission/reception of using the OFDMA system;
Fig. 4 shows the flow chart of handling process in the wireless communications method of first exemplary embodiment according to the present invention;
Fig. 5 shows the schematic diagram of the annexation between the assembly that comprises in the wireless communication system;
Fig. 6 shows the block diagram of the overall arrangement of base station;
Fig. 7 is the view that is used to explain the frame structure of second exemplary embodiment according to the present invention;
Fig. 8 A and 8B are the views that is used to explain the different operating of channel-assignment unit; And
Fig. 9 shows the flow chart according to handling process in the wireless communications method of second embodiment of the invention.
Embodiment
＜the first exemplary embodiment 〉
Hereinafter with reference to accompanying drawing first exemplary embodiment of the present invention is described.In this embodiment, size, material, appointment numerical value or the like only are the examples that provides for being convenient to complete understanding purpose of the present invention, except as otherwise noted, and are not intended to restriction the present invention.In specification and accompanying drawing, the assembly with same or similar function and configuration is represented by same reference numbers, therefore, has omitted its repetition of explanation, and other assemblies that do not have direct relation with the present invention are not shown.
Wireless communication system is made up by terminal equipment and radio communication device (base station) and forms, and wherein, terminal equipment is by expressions such as phs terminal, mobile phones, and radio communication device is fixedly arranged with specific interval and communicates with terminal equipment.In first exemplary embodiment, entire wireless communication system has been described so that understand the present invention, after this, described as the base station of radio communication device and as the detailed configuration of the phs terminal of terminal equipment.In addition, in first exemplary embodiment, although use phs terminal to show terminal equipment, but terminal equipment is not limited to this, can also be any other electronic equipment, comprise: mobile phone, notebook personal computer, PDA (personal digital assistant), digital camera, music player, automobile navigation instrument, portable television, game station, DVD player, remote controllers etc.
(wireless communication system 100)
Fig. 1 shows the schematic diagram of the annexation between the assembly that comprises in the wireless communication system.Wireless communication system 100 comprises phs terminal 110 (110A and 110B), base station 120 (120A and 120B), comprises the communication network 130 and the Relay Server 140 of ISDN (integrated services digital network), the Internet, special circuit etc.
In wireless communication system 100, when the user by communication line from he/her phs terminal 110A when another phs terminal 110B inserts, the request that phs terminal 110A sends wireless access to the base station 120A that is positioned at coverage.When the request that receives this wireless access, base station 120A sends the request that the communication of the equity side that communicates by letter is inserted by communication network 130 to Relay Server 140.Then; Relay Server 140 is by the location registration information with reference to another phs terminal 110B; selection for example is positioned at the base station 120B of the coverage of phs terminal 110B; thereby guarantee the communication path safety between base station 120A and the base station 120B, to set up communicating by letter between phs terminal 110A and the phs terminal 110B.
In such wireless communication system 100, adopted various technology to improve the communication speed and the communication quality of phs terminal 110 and base station 120.In first exemplary embodiment, for example, adopted the PHS communication technology of future generation, and between phs terminal 110 and base station 120, carried out radio communication based on the OFDMA/TDMA-TDD system as ARIB STD T95 or PHS MoU and so on.In this embodiment, by distributing the anchor channel to plan improvement to communication stability, this anchor channel sends the control information as MCS (modulation and encoding scheme), communication channel mapping, error message etc. and so in this radio communication to the PRU in preset frequency territory.The detailed configuration of the base station 120 in such wireless communication system 100 below will be described.
(base station 120)
Fig. 2 shows the block diagram of the overall arrangement of base station.Base station 120 comprises base station controller 210, base station stored device 212, base station radio communication unit 214 and wire communication unit, base station 216.
Base station stored device 212 is made of ROM, RAM, EEPROM, non-volatile ram, flash memory, HDD etc., and the program of handling in the storage base station controller 210, temporal information etc.
Base station radio communication unit 214 is set up and the communicating by letter of phs terminal 110, and with phs terminal 110 swap datas.In addition, unit 214 can be according to being identified for carrying out the optimum MCS of efficient communication with the quality of communicating by letter of phs terminal 110, and provide this MCS by anchor channel 180 request phs terminals 110.
Wire communication unit, base station 216 can insert the various servers that comprise Relay Server 140 by communication network 130.
In addition, in this embodiment, base station controller 210 is also as channel-assignment unit 220.As mentioned above, in the OFDMA/TDMA-TDD system, frequency axis and time shaft all are divided into communication block again, give a plurality of terminal equipments with these communication block dynamic assignment, thereby allow efficient communication.The defined communication block of time slot is known as PRU (physical resource unit) in the subchannel.
Channel-assignment unit 220 is distributed to PRU with extra channel (below be called EXCH) and anchor channel (below be called ANCH).Distribute an ANCH to each terminal equipment, and ANCH comprises the mapping that is assigned with the PRU of terminal equipment EXCH.EXCH is the actual channel that comprises data, and, according to data volume and communication conditions a plurality of EXCH are distributed to a terminal equipment.
For the distribution of PRU, channel-assignment unit 220 is distributed to the PRU in preset frequency territory with ANCH, and EXCH is distributed to and the PRU that is assigned with different territory, the preset frequency territory of ANCH.This allows definitely to distinguish being assigned with the frequency domain of the PRU of ANCH and the frequency domain that is assigned with the PRU of EXCH.Correspondingly, after PRU distributes ANCH, owing to distribute the EXCH of other phs terminals 110 to the PRU adjacent with ANCH, thereby can prevent that ANCH and EXCH from producing interference.
Fig. 3 A and 3B are the views that is used for explaining at the frame structure of the data of radio communication transmissions/receptions of using the OFDMA system, and Fig. 3 A shows the frame structure of conventional P RU distribution, and Fig. 3 B shows the frame structure according to the PRU distribution of this embodiment.In OFDMA (or OFDM), the mapping of two dimensionization on time shaft and frequency axis direction is provided, on the frequency axis direction, arrange a plurality of subchannels 160 with constant base band distance, and dispose PRU 170 at each time slot (tdma slot) 162 in each subchannel 160.
For example, if the effective band of OFDM carrier wave is 18MHz, then this carrier wave is divided into 480 subcarriers, and 24 subcarrier combination are formed a subchannel 160,20 subchannels 160 are made up of a carrier wave, and the band occupancy of a subchannel 160 becomes 900kHz.In addition, for example, if time slot is 5 milliseconds and is divided into up link and down link by TDD that then each in the uplink and downlink link all has 2.5 milliseconds.In addition, because TDMA is divided into 4 parts with 2.5 milliseconds, thereby a time slot 162 becomes 625 microseconds.
Correspondingly, according to the 625 microsecond duration of base band distance and time-division, PRU 170 is by the band occupancy definition of 900kHz.In addition, being used for the frame that communicates with specific phs terminal 110 is made of the EXCH 182 of ANCH relevant with control signal 180 and storage data.
At each phs terminal 110, distribute ANCH 180 respectively, and ANCH 180 takies a PRU 170.For this ANCH 180, distribute PRU 170 with high communication quality based on the result of the carrier sense of base station 120.Herein, based on the PRU 170 of the frame of phs terminal 110 swap datas in the SINR ratio of interference and noise (signal with) or bit error rate carry out carrier sense.
As shown in phantom in Figure 3, EXCH 182 is to the PRU 170 of each user's distribution as the communication path in the FM pattern, and, can distribute a plurality of EXCH182 to a phs terminal 110.For this EXCH 182, distribute PRU 170 based on the result of carrier sense (whether using PRU 170) to determine other users.As mentioned above, in this allocation result shown in the mapping of ANCH 180.
In addition, in Fig. 3, control channel 184 (CCH: control channel is called CCH) is distributed to the PRU 170 in the highest frequency territory of base station 120 employed frequencies.This CCH 184 of 120 indexing transfers from the base station, and phs terminal 110 can be by receiving identifier (CSID) candidate that conduct is communicated by letter with received signal strength indicator (RSSI) that CCH 184 discerns base station 120.In addition,, be not limited thereto, CCH 184 can be distributed to PRU 170 with other frequency domains although in this embodiment CCH 184 is distributed to PRU 170 with highest frequency territory.
In the conventional allocation of the PRU 170 that ANCH 180 and EXCH 182 are carried out, the result based on the carrier sense of base station 120 distributes ANCH180 to the PRU 170 with high communication quality, and distributes EXCH 182 to the untapped PRU 170 of other users.Therefore, as shown in Figure 3A, be assigned with the PRU 170 of EXCH 182 be assigned with the PRU 170 of ANCH 180 adjacent.(for example, 256QAM), then ANCH 180 is disturbed by EXCH 182, and this has caused the deterioration of communication quality if this EXCH 182 uses the high power modulating system.
In order to overcome the problems referred to above, in this embodiment, shown in Fig. 3 B, channel-assignment unit 220 is distributed to the PRU 170 in preset frequency territory 190 with ANCH 180, and EXCH 182 is distributed to and the PRU170 that is assigned with the different frequency domain 192 in the preset frequency territory of ANCH 180.
In this manner, by distinguishing to being assigned with the frequency domain of the PRU 170 of ANCH 180 and the frequency domain that is assigned with the PRU 170 of EXCH 182, only ANCH 180 is distributed to the PRU 170 in preset frequency territory 190, and can avoid after distributing ANCH 180 to the PRU 170 distribution EXCH 182 adjacent with ANCH 180.Correspondingly, can reduce by the interference of 182 couples of ANCH 180 of EXCH, this can realize the raising of communication stability.
Being assigned with can be preferably adjacent with the frequency domain that is assigned with CCH 184 with the preset frequency territory 190 of the PRU 170 of ANCH 180, and can more preferably be biased to the highest or low-limit frequency territory of base station 120 employed frequencies.
Because CCH 184 is indexing transfers, thereby the situation that exists some not communicate.Correspondingly, because the PRU 170 that is assigned with CCH 184 has low the interference with adjacent PRU 170, thereby, can reduce being assigned with interference with the PRU 170 of ANCH 180 by ANCH 180 being distributed to this PRU 170.
In addition, by preset frequency territory 190 being biased to the highest or low-limit frequency territory of base station 120 employed frequencies, can reduce the number of the PRU 170 adjacent with preset frequency territory 190.Correspondingly, can reduce by 170 couples of adjacent PRU and be assigned with interference with the PRU 170 of ANCH 180.
In addition, can be assigned with preset frequency territory 190 adjacents with ANCH 180 null field 194 that does not only distribute ANCH 180 but also do not distribute EXCH 182 be provided.When the communication quality of and ANCH 180 adjacent along the frequency axis direction with EXCH 182 as ANCH180 worsens, although the distribution of ANCH 180 is limited to preset frequency territory 190, ANCH 180 become with EXCH182 during boundary adjacent.Yet, by null field 194 is provided as mentioned above, can also separate ANCH 180 and EXCH 182 definitely, this has realized that the extreme of disturbing reduces.
In addition, in this embodiment, although arranged that in preset frequency territory 190 two subchannels 160 to distribute ANCH 180, are not limited thereto, the number of the subchannel of being arranged 160 is can be optional.For example, under the situation of the slight gathering area of population mounted base station 120, the number of the subchannel of being arranged 160 is set to 1.Therefore, the number of the subchannel of arranging in the territory 192 different with the preset frequency territory 160 can increase, and correspondingly, the number that is assigned with the PRU 170 of EXCH 182 also can increase.Correspondingly, can increase the communication speed of phs terminal 110 and base station 120.In addition, for example, for inserting the base station 120 that install frequent position (as busy street), distribute to the number of the subchannel 160 in preset frequency territory 190 by increase, can when increasing the number that inserts simultaneously, under the situation that does not almost have ANCH 180 disconnections to connect, carry out stable communication.
In addition, the frequency band (number of subchannel 160) of distributing to preset frequency territory 190 can be set to semifixedly the parameter of each base station 120.In addition, can change the number of subchannel, perhaps can dynamically change the number of subchannel according to the number that terminal inserts by Long-distance Control.
In above-mentioned wireless communication system 100, distinguish being assigned with the frequency domain of the PRU 170 of ANCH 180 and the frequency domain that is assigned with the PRU 170 of EXCH 182, and, the PRU 170 in preset frequency territory 190 is distributed to ANCH 180 in base station 120, and EXCH 182 is distributed to and the PRU 170 that is assigned with different territory 192, the preset frequency territory of ANCH 180.Therefore, can reduce by the interference of 182 couples of ANCH 180 of EXCH, this has realized the raising of communication stability.Next, use above-mentioned base station 120 to carry out the wireless communications method of radio communication with describing.
(wireless communications method)
Fig. 4 shows the flow chart according to handling process in the wireless communications method of this embodiment.120 pairs of base stations and CCH 184 adjacent PRU 170 (being the PRU170 in preset frequency territory 190) carry out carrier sense, and ANCH 180 distributed to have low the interference and the PRU 170 (S300:ANCH allocation step) of high communication quality.Next, the PRU 170 in 120 pairs of territories 192 different with the preset frequency territory, base station carries out carrier sense, determines whether other users use PRU 170, and EXCH 182 is distributed to the untapped PRU 170 of other users (S302:EXCH allocation step).
Subsequently, position and the number of the PRU 170 of EXCH 182 is input in the mapping of ANCH 180 as assignment information, and sends it to each terminal equipment (phs terminal 110) (S304: the mapping input step).Phs terminal 110 reads ANCH 180, and communicates by obtaining EXCH 182 according to included mapping among the ANCH 180 that is read.Then, because extreme has reduced the interference to ANCH 180, thereby can carry out stable communication.
Although described first exemplary embodiment of the present invention with reference to the accompanying drawings, self-evident ground the invention is not restricted to this embodiment.To those skilled in the art apparently, under the prerequisite that does not break away from the spirit and scope of the present invention of setting forth in the claim, can make various modifications and change, and should be appreciated that technical scope of the present invention comprises these modifications and change.
Not must with shown in the order described in the flow chart carry out step in the wireless communications method of the present disclosure, can also carry out these steps concurrently or by subroutine.
The present invention can be applied to use the OFDMA system to carry out the base station and the wireless communications method of radio communication.
＜the second exemplary embodiment 〉
Describe second exemplary embodiment of the present invention in detail hereinafter with reference to accompanying drawing.In this embodiment, size, material, other appointment numerical value or the like only are the examples that provides for being convenient to complete understanding purpose of the present invention, except as otherwise noted, and are not intended to restriction the present invention.In specification and accompanying drawing, the assembly with same or similar function and configuration is represented by same reference numbers, therefore, has omitted its repetition of explanation, and other assemblies that do not have direct relation with the present invention are not shown.
Wireless communication system is made up by terminal equipment and base station and forms, and wherein, terminal equipment is by expressions such as phs terminal, mobile phones, and the base station is fixedly arranged with specific interval and communicates with terminal equipment.In the following description, at first describe entire wireless communication system, after this, described the detailed configuration of base station.In addition, in this embodiment, although use phs terminal to show terminal equipment, but terminal equipment is not limited to this, can also be any other electronic equipment, comprise: mobile phone, notebook personal computer, PDA (personal digital assistant), digital camera, music player, automobile navigation instrument, portable television, game station, DVD player, remote controllers etc.
(wireless communication system 1100)
Fig. 5 shows the schematic diagram of the annexation between the assembly that comprises in the wireless communication system.Wireless communication system 1100 comprises phs terminal 1110 (1110A and 1110B), base station 1120 (1120A and 1120B), comprises the communication network 1130 and the Relay Server 1140 of ISDN (integrated services digital network), the Internet, special circuit etc.
In wireless communication system 1100, when the user by communication line from he/her phs terminal 1110A when another phs terminal 1110B inserts, the request that phs terminal 1110A sends wireless access to the base station 1120A that is positioned at coverage.When the request that receives this wireless access, base station 1120A sends the request that the communication of the equity side that communicates by letter is inserted by communication network 1130 to Relay Server 1140.Then, Relay Server 1140 is by the location registration information with reference to phs terminal 1110B, selection for example is positioned at the base station 1120B of the coverage of phs terminal 1110B, thereby guaranteed the safety of the communication path between base station 1120A and the base station 1120B, to set up communicating by letter between phs terminal 1110A and the phs terminal 1110B.
In such wireless communication system 1100, adopted various technology to improve the communication speed and the communication quality of phs terminal 1110 and base station 1120.In second exemplary embodiment, for example, adopted the PHS communication technology of future generation, and between phs terminal 1110 and base station 1120, carried out radio communication based on the OFDMA/TDMA-TDD system as ARIB STD T95 or PHS MoU and so on.In this embodiment, by distributing the anchor channel to plan improvement to communication stability, this anchor channel sends the control information as MCS (modulation and encoding scheme), communication channel mapping, error message etc. and so in this radio communication to the PRU in preset frequency territory.The detailed configuration of the base station 1120 in such wireless communication system 1100 below will be described.
(base station 1120)
Fig. 6 shows the block diagram of the overall arrangement of base station.Base station 1120 comprises base station controller 1210, base station stored device 1212, base station radio communication unit 1214 and wire communication unit, base station 1216.
The signal that base station radio communication unit 1214 will receive from antenna 1218 forms array, with set up with phs terminal 1110 communicate by letter and with phs terminal 1110 swap datas.
In this embodiment, antenna 1218 has the adaptive array function and can fall into the directivity that (null steering) dynamically changes the electric wave that will send/receive by beam shaping and zero.Herein, beam shaping increases received-signal strength by adjusting from the phase place of the electric wave of a plurality of antennas 1218 outputs, and along with depart from zero position that falls into of cancelling each other mutually by the phase place that makes electric wave, received-signal strength weakens.
Wire communication unit, base station 1216 can insert the various servers that comprise Relay Server 1140 by communication network 1130.
In addition, in this embodiment, base station controller 1210 is also as channel-assignment unit 1220.
The anchor channel (below be called ANCH) that channel-assignment unit 1220 will be relevant with control signal and the extra channel of storage data (below be called EXCH) distribute to 625 microsecond duration according to base band distance and time-division, by the PRU (physical resource unit) of the band occupancy definition of 900kHz.
Fig. 7 is the view that is used to explain according to the frame structure of this embodiment.The OFDMA/TDMA system has the mapping of two dimensionization on time shaft and frequency axis direction.On the frequency axis direction, arrange a plurality of subchannels with constant base band distance, and dispose PRU at each time slot (tdma slot) in each subchannel.
In this embodiment, ANCH 1300 is control signals of FM pattern, and for example comprises: mapping, the assignment information that is used to indicate EXCH 1302; The timing controlled bit; Transmit the output control bit; ACK bit is used for the data arrival etc. whether notice has HARQ (mixing automatic repeat requests, a kind of automatic repeat requests).
Based on the result of carrier sense, ANCH 1300 is distributed to the PRU with least interference, and, distribute an ANCH 1300 regularly at a phs terminal 1110.
EXCH 1302 distributes at each terminal equipment, as the PRU of the communication path in the FM pattern, and, can distribute a plurality of EXCH 1302 to a phs terminal 1110.
Determine by carrier sense whether other users use PRU, thereby carry out distribution EXCH1302.Which PRU the mapping of ANCH 1300 distributes as EXCH 1302 to each terminal equipment (phs terminal 1110) notice to predetermined phs terminal 1110, and at each frame dynamic assignment PRU.
As shown in Figure 7, channel-assignment unit 1220 can be distributed to the phs terminal 1110 employed EXCH 1302a that are assigned with ANCH 1300a and other PRU that are assigned with the identical time slot of PRU of ANCH 1300a.
Correspondingly, will use the EXCH 1302a of the phs terminal 1110 of ANCH 1300a to distribute to the PRU that is assigned with the time slot of ANCH 1300a.Correspondingly, will be wherein ANCH1300b and the 1300c EXCH 1302 that is assigned to the phs terminal 1110 of other time slots distribute to the PRU that is assigned with the time slot of ANCH 1300.
In addition, at each phs terminal 1110, channel-assignment unit 1220 is distributed to ANCH 1300 ( ANCH 1300a, 1300b and 1300c among Fig. 7) PRU of different time-gap.
According at each phs terminal 1110 with the configuration that ANCH 1300 distributes to different time-gap, at each phs terminal 1110, EXCH 1302 is distributed to different time-gap.Correspondingly, a time slot is used by a phs terminal 1110, therefore, can prevent the interference of 1302 couples of ANCH 1300 of EXCH of other phs terminals 1110.
In addition, owing to can communicate by time division way (at each time slot) at each phs terminal 1110, thereby the antenna 1218 formation beam shapings that can have the adaptive array function by use, along predetermined direction electric wave is narrowed down, and can fall into and prevent and the disturbing of other base stations 1120 by forming zero to minimum degree.
In other words, owing to can at any time phs terminal 1110 be appointed as the communication party, thereby can on the direction of specified phs terminal 1110, form beam shaping, and on the direction different, form zero and fall into the direction of specified phs terminal 1110.This allows farthest to use the effect of adaptive array function.
In addition, in this embodiment, channel-assignment unit 1220 is distributed to PRU 1310a or the PRU 1310b adjacent or approaching with control channel 1304 with ANCH 1300.
Because control channel 1304 is intermittently useds, thereby has many situations, wherein is assigned with the PRU that is arranged in the subchannel with control channel 1304 and does not communicate.Correspondingly owing to low the interference arranged with adjacent or approaching PRU 1310a and the PRU 1310b of control channel 1304, thereby can be by ANCH 1300 being distributed to corresponding PRU avoids because the communication disruption that the interference of ANCH1300 is caused.
Fig. 8 A and 8B are the views that is used to explain the different operating of channel-assignment unit, show channel-assignment unit and will be distributed to the situation of identical time slot by the employed ANCH of a plurality of phs terminals.
Shown in Fig. 8 A, have following situation: wherein channel-assignment unit 1220 will be distributed to the PRU of identical time slot by a plurality of phs terminal 1110 employed ANCH 1300a and 1300b based on the result of carrier sense.In this case, the channel-assignment unit 1220 phs terminal 1110 employed EXCH 1302a that will be assigned with ANCH 1300a distribute to the PRU adjacent with ANCH1300a.Similarly, the channel-assignment unit 1220 phs terminal 1110 employed EXCH 1302b that will be assigned with ANCH 1300b distribute to the PRU adjacent with ANCH 1300b.
In this manner, when to a plurality of ANCH 1300 of identical time slot allocation, if will use the EXCH 1302a of the phs terminal 1110 of ANCH 1300 to distribute to the PRU adjacent with ANCH 1300, then have identical modulation scheme or received-signal strength, thereby can suppress interference from the EXCH 1320b of other phs terminals 1110 owing to adjacent PRU.
In addition, shown in Fig. 8 B, there is following situation: wherein will distribute to the PRU 1310b (PRU of identical time slot) adjacent with 1300b by a plurality of phs terminal 1110 employed ANCH 1300a with PRU 1310a (adjacent) with control channel 1304.In this case and since with control channel 1304 adjacent areas in arranged ANCH 1300 thick and fast, thereby can suppress interference from the EXCH 1302 of other phs terminals 1110.
At this moment, if EXCH 1302 is distributed to the time slot identical with ANCH 1300, then the EXCH 1302a with a plurality of phs terminals 1110 distributes to identical time slot with 1302b.In this case, by between phs terminal 1110 employed EXCH 1302a and EXCH 1302b, providing unappropriated PRU, can avoid the overlapping of wave frequency and prevent therebetween interference.
In addition, data volume more greatly and not EXCH 1302a is all distributed to situation about being assigned with the identical time slot of the time slot of ANCH 1300a under, EXCH 1302a can be distributed to the PRU (seeing the 3rd time slot among Fig. 8 B) of the different time-gap that does not communicate.Even in this case,, thereby can communicate by time division way (at each time slot) at each phs terminal 1110 owing to identical phs terminal 1110 employed EXCH 1302 are arranged in the identical time slot.Correspondingly, owing to use antenna 1218, can electric wave be narrowed down along predetermined direction, thereby the interference with other base stations 1120 can be suppressed to minimum with adaptive array function.
In above-mentioned wireless communication system 1100, base station 1120 will use the EXCH 1302a of the phs terminal 1100 of ANCH 1300a to distribute to the PRU that is assigned with the time slot of ANCH 1300a.This means that the EXCH 1302 with other phs terminals 1110 does not distribute to the PRU that is assigned with the time slot of ANCH 1300.Correspondingly, can prevent the interference of 1302 couples of ANCH 1300 of EXCH of other phs terminals 1110, this has realized stable communication.Next, use above-mentioned base station 1120 to carry out the wireless communications method of radio communication with describing.
(wireless communications method)
Fig. 9 shows the flow chart according to handling process in the wireless communications method of this embodiment.
Carrier senses are carried out in base station 120, and ANCH 1300 is distributed to the PRU (S1350:ANCH allocation step) adjacent or approaching with having the low control channel that disturbs 1304.Next, carry out carrier sense determining whether other users use PRU, and distribute and be assigned with PRU in the identical time slot of the time slot of ANCH 1300, that wherein do not communicate (S1352:EXCH allocation step) to EXCH 1302.
Subsequently, position and the number of the PRU of EXCH 1302 is input in the mapping of ANCH 1300 as assignment information, and sends it to each terminal equipment (phs terminal 1110) (S1354: the mapping input step).Phs terminal 1110 reads ANCH 1300, and by obtaining EXCH 1302 to communicate according to included mapping among the ANCH 1300 that is read.Then, because extreme has reduced the interference to ANCH 1300, thereby can carry out stable communication.
Although described the second embodiment of the present invention with reference to the accompanying drawings, self-evident ground the invention is not restricted to this embodiment.To those skilled in the art apparently, under the prerequisite that does not break away from the spirit and scope of the invention of setting forth in the claim, can make various modifications and change, and should be appreciated that technical scope of the present invention comprises these modifications and change.
Must be on sequential with shown in the order described in the flow chart carry out step in the wireless communications method of the present disclosure, can also carry out these steps concurrently or by subroutine.The present invention can be applicable to use the OFDMA system to carry out the base station and the wireless communications method of radio communication.
Claims (12)
1. base station of using the OFDMA system to come to carry out radio communication with one or more terminal equipments, described base station comprises:
Channel-assignment unit is divided extra channel that is used in data communication and the anchor channel that comprises in being mapped in to PRU, and the position that is assigned with the PRU of described extra channel has been indicated in described mapping,
Wherein, described channel-assignment unit is given the PRU in preset frequency territory with described anchor channel allocation, and described additional channel assignment is given the PRU in the territory different with described preset frequency territory.
2. base station according to claim 1, wherein, described preset frequency territory be assigned with the frequency domain of control channel adjacent.
3. base station according to claim 1 and 2 wherein, is biased to employed highest frequency territory, base station or low-limit frequency territory with described preset frequency territory.
4. a wireless communications method that uses the OFDMA system adopts one or more terminal equipments and base station,
Wherein, when described base station when PRU divides the extra channel be used in data communication and comprise anchor channel in being mapped in, described anchor channel allocation is given the PRU in preset frequency territory in described base station, and described additional channel assignment given and the PRU that is assigned with different territory, the described preset frequency territory of described anchor channel, the position that is assigned with the PRU of described extra channel has been indicated in wherein said mapping.
5. base station of using the OFDMA system to come to carry out radio communication with one or more terminal equipments, described base station comprises:
Channel-assignment unit is divided extra channel that is used in data communication and the anchor channel that comprises mapping to PRU, and the position that is assigned with the PRU of described extra channel has been indicated in described mapping,
Wherein, described channel-assignment unit will be assigned with the employed additional channel assignment of the terminal equipment of described anchor channel and give and the different PRU that are assigned with the identical time slot of PRU of described anchor channel.
6. base station according to claim 5, wherein, if described channel-assignment unit with a plurality of anchor channel allocation give the PRU of identical time slot, then described channel-assignment unit will be assigned with the employed additional channel assignment of the terminal equipment of an anchor channel give with a described anchor channel along the adjacent PRU of frequency direction.
7. base station of using the OFDMA system to come to carry out radio communication with one or more terminal equipments, described base station comprises:
Channel-assignment unit is divided extra channel that is used in data communication and the anchor channel that comprises mapping to PRU, and the position that is assigned with the PRU of described extra channel has been indicated in described mapping,
Wherein, described channel-assignment unit is given an employed additional channel assignment of terminal equipment the PRU of a time slot.
8. base station according to claim 7, wherein, described channel-assignment unit is given described additional channel assignment and the PRU that is assigned with the identical time slot of the employed anchor channel of the terminal equipment of described extra channel.
9. according to each described base station in the claim 5 to 8, wherein, at each terminal equipment, described channel-assignment unit is given described anchor channel allocation the PRU of different time-gap.
10. according to each described base station in the claim 5 to 8, wherein, described channel-assignment unit is given the PRU adjacent or approaching with control channel with described anchor channel allocation.
11., also comprise adaptive array antenna according to each described base station in the claim 5 to 8.
12. a wireless communications method that uses the OFDMA system adopts one or more terminal equipments and base station,
Wherein, when described base station when PRU divides the extra channel be used in data communication and comprise anchor channel in being mapped in, described base station will be assigned with the employed additional channel assignment of the terminal equipment of described anchor channel and give and the different PRU that are assigned with the identical time slot of PRU of described anchor channel, and the position that is assigned with the PRU of described extra channel has been indicated in wherein said mapping.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008138473A JP4654267B2 (en) | 2008-05-27 | 2008-05-27 | Base station and radio communication method |
| JP2008138472A JP4588083B2 (en) | 2008-05-27 | 2008-05-27 | Base station and radio communication method |
| JP2008138472 | 2008-05-27 | ||
| JP2008-138472 | 2008-05-27 | ||
| JP2008-138473 | 2008-05-27 | ||
| JP2008138473 | 2008-05-27 |
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| CN101594684A true CN101594684A (en) | 2009-12-02 |
| CN101594684B CN101594684B (en) | 2012-08-08 |
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| CN2009102028532A Expired - Fee Related CN101594684B (en) | 2008-05-27 | 2009-05-26 | Base station and wireless communication method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103733669A (en) * | 2011-07-26 | 2014-04-16 | 京瓷株式会社 | Wireless base station and communication control method |
| CN105873230A (en) * | 2016-03-29 | 2016-08-17 | 南京林洋电力科技有限公司 | Synchronization method for broadband carrier broadcast communication of power line |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8687545B2 (en) * | 2008-08-11 | 2014-04-01 | Qualcomm Incorporated | Anchor carrier in a multiple carrier wireless communication system |
| JP2011124942A (en) * | 2009-12-14 | 2011-06-23 | Kyocera Corp | Mobile communication system, base station, mobile station, and radio communication method |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4342171B2 (en) * | 2002-12-25 | 2009-10-14 | ソフトバンクテレコム株式会社 | Mobile terminal |
| US7835318B2 (en) * | 2003-04-23 | 2010-11-16 | Telecom Italia S.P.A. | Radiotelephony network with multi-carrier packet data transmission |
| MY139873A (en) * | 2003-10-24 | 2009-11-30 | Qualcomm Inc | Local and wide-area transmissions in a wireless broadcast network |
| JP2005341415A (en) * | 2004-05-28 | 2005-12-08 | Sharp Corp | Communication channel selecting method, wireless communication device, program, and record medium |
| US7852746B2 (en) * | 2004-08-25 | 2010-12-14 | Qualcomm Incorporated | Transmission of signaling in an OFDM-based system |
| JP4463264B2 (en) * | 2006-11-28 | 2010-05-19 | 京セラ株式会社 | OFDMA communication system and communication method |
-
2008
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103733669A (en) * | 2011-07-26 | 2014-04-16 | 京瓷株式会社 | Wireless base station and communication control method |
| CN105873230A (en) * | 2016-03-29 | 2016-08-17 | 南京林洋电力科技有限公司 | Synchronization method for broadband carrier broadcast communication of power line |
Also Published As
| Publication number | Publication date |
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| JP2009290339A (en) | 2009-12-10 |
| CN101594684B (en) | 2012-08-08 |
| JP4588083B2 (en) | 2010-11-24 |
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