CN101594684B - Base station and wireless communication method - Google Patents
Base station and wireless communication method Download PDFInfo
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- CN101594684B CN101594684B CN2009102028532A CN200910202853A CN101594684B CN 101594684 B CN101594684 B CN 101594684B CN 2009102028532 A CN2009102028532 A CN 2009102028532A CN 200910202853 A CN200910202853 A CN 200910202853A CN 101594684 B CN101594684 B CN 101594684B
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Abstract
The invention provides a base station and a wireless communication method. The base station conducts wireless communication with one or more terminal devices using an OFDMA system, and has: a channel assigning unit that assigns PRU an extra channel used for data communication and an anchor channel including a map indicating the position of PRU to which the extra channel is assigned, wherein the channel assigning unit assigns the anchor channel to PRU of a predetermined frequency domain and assigns the extra channel to PRU of a domain other than the predetermined frequency domain.
Description
The cross reference of related application
The priority of Japanese patent application 2008-138472 that the application requires to submit on May 27th, 2008 and the Japanese patent application 2008-138473 that submits on May 27th, 2008, its whole disclosures are incorporated into here 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 through the TDD (time division duplex) of time division way switching transmission/reception and the FDD (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 through 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 to 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 system of effective 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 through making up a plurality of (for example 24) subcarrier to form subchannel, and allowed multiple access to insert through between a plurality of terminal equipments, sharing all subchannels.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 with 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 sub-links 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 one 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 the subchannel is known as PRU (physical resource unit), and supposes 36 to 40 PRU of each base station use.
As stated, in the time of can using 20 subchannel 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 through anchor dynamics of channels ground, thereby can send/receive mass data at a high speed.
Yet the PRU in the OFDMA system exists and possibly 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 in the cochannel sector, to communicate continuously and reduce cochannel and disturb.
In addition, the PRU in the OFDMA system exist maybe 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 in the cochannel sector, to have 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 stated, 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 possibly have different communication conditions and with the different distance of base station, and correspondingly have different modulation schemes, power and delay, thereby possibly 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 possibly receive 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 through the repeat requests of sending like 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 stated, the anchor channel is carried out distribution through carrying out carrier sense, and before communication was cut off, the position of the PRU of anchor channel can not change.Therefore, although can confirm the existence with the interference of predetermined PRU, can't confirm 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 and 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 received 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 through 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 through 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; Said base station comprises: channel-assignment unit; Divide the extra channel that is used in data communication and comprise the anchor channel in being mapped in to PRU, the position that is assigned with the PRU of said extra channel has been indicated in said mapping, wherein; Said channel-assignment unit is given the PRU in preset frequency territory with said anchor channel allocation, and gives the PRU in the territory different with said preset frequency territory with said additional channel assignment.
According to above-mentioned configuration, owing to only the anchor channel allocation is given the PRU in preset frequency territory, thereby can will be assigned with the frequency domain of the PRU of this anchor channel with confirming and be assigned with and distinguish with the frequency domain of 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, said 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, the PRU and the adjacent PRU that are assigned with control channel have 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, said preset frequency territory is biased to employed highest frequency territory, base station or low-limit frequency territory.
If said preset frequency territory is set to employed intermediate frequency territory, base station, then be assigned with the interference that possibly receive the extra channel that is assigned to and more low-frequency PRU higher with the PRU of anchor channel than the preset frequency territory of this PRU.On the contrary, according to above-mentioned configuration, can be assigned with half the with the PRU number under the decreased number of the adjacent PRU of the PRU of anchor channel to the situation that is set to the intermediate frequency territory in the preset frequency territory, 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 said base station when PRU divides the extra channel be used in data communication and comprises the anchor channel being mapped in, said base station is with the PRU of said anchor channel allocation to the preset frequency territory; And said additional channel assignment given and the PRU that is assigned with different territory, the said preset frequency territory of said anchor channel, the position that is assigned with the PRU of said 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; Said 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 said extra channel has been indicated in said mapping, and wherein, said channel-assignment unit will be assigned with the employed additional channel assignment of the terminal equipment of said anchor channel and give and the different PRU that are assigned with the identical time slot of PRU of said anchor channel.
According to above-mentioned configuration, the additional channel assignment of the terminal equipment that uses this anchor channel given be assigned with PRU with the time slot of this anchor channel.Correspondingly, the additional channel assignment of other-end equipment is given and be assigned with PRU with the time slot of this anchor channel.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 said channel-assignment unit will be assigned with the employed additional channel assignment of the terminal equipment of an anchor channel give with a said 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; Said base station comprises: channel-assignment unit, divide 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 said extra channel has been indicated in said mapping; Wherein, said 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 to each terminal equipment; Can communicate through 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, said channel-assignment unit is given said additional channel assignment and the PRU that is assigned with the identical time slot of the employed anchor channel of the terminal equipment of said 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, to each terminal equipment, said 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 to each terminal equipment to 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 through time division way to each terminal equipment, thereby can farthest obtain the effect of adaptive array antenna.
According to the tenth aspect of the invention, said 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 through giving this PRU with the anchor channel allocation.
According to an eleventh aspect of the invention, said 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 said base station when PRU divides the extra channel be used in data communication and comprises the anchor channel being mapped in, said base station will be assigned with the employed additional channel assignment of the terminal equipment of said anchor channel to and the different PRU that are assigned with the identical time slot of PRU of said anchor channel, the position that is assigned with the PRU of said 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 through 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 through considering to be assigned with the position of the PRU of an employed extra channel of terminal equipment.
Description of drawings
To describe schematic aspect of the present invention in detail with reference to following accompanying drawing, in the accompanying drawings:
Fig. 1 shows the sketch map 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 sketch map 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
< first exemplary embodiment >
Below will illustrate and describe first exemplary embodiment of the present invention.In this embodiment, size, material, appointment numerical value or the like only are the examples that provides from being convenient to complete understanding the object of the 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, comprising: 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 sketch map 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 through 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 to the communication access of communication peer through communication network 130 to Relay Server 140.Then; Relay Server 140 is through 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 like ARIB STD T95 or PHS MoU and so on.In this embodiment; Through distributing the anchor channel to plan the improvement to communication stability, this anchor channel sends the control information like 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.
Whole base station 120 is managed and controlled to base station controller 210 through the semiconductor integrated circuit that comprises CPU (CPU).In addition, the program in the base station controller 210 use base station stored devices 212 is controlled the communication access of phs terminal 110 or 110 pairs of communication networks 130 of other phs terminals.
Base station stored device 212 is made up 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, the optimum MCS of efficient communication can basis be confirmed to be used to carry out with the quality of communicating by letter of phs terminal 110 in unit 214, and through anchor channel 180 request phs terminals 110 this MCS is provided.
Wire communication unit, base station 216 can insert the various servers that comprise Relay Server 140 through communication network 130.
In addition, in this embodiment, base station controller 210 is also as channel-assignment unit 220.As stated, 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 one 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 allow to confirm that ground distinguishes 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 distribution ANCH, owing to do not 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 to 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 number of sub-carrier, and the combination of 24 number of sub-carrier is formed a subchannel 160; 20 subchannel 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, the frame that is used for communicating with specific phs terminal 110 is made up of the ANCH relevant with control signal 180 and the EXCH 182 of storage data.
To 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.Here, 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.
Shown in dotted line among Fig. 3, EXCH 182 distributes the PRU 170 as the communication path in the FM pattern to each user, 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 confirm other users.As stated, 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 through receiving identifier (CSID) candidate that conduct is communicated by letter with reception signal strength indicator (RSSI) that CCH 184 discerns base station 120.In addition,, be not limited thereto, can CCH 184 be distributed to the PRU 170 with other frequency domains although in this embodiment CCH 184 is distributed to the 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 ANCH to the PRU with high communication quality 170
180, and to the untapped PRU 170 distribution EXCH 182 of other users.Therefore, shown in Fig. 3 A, be assigned with the PRU of EXCH 182 170 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; Through 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 distributing EXCH 182 with ANCH 180 adjacent PRU 170.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 through ANCH 180 being distributed to this PRU 170.
In addition, through 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, through null field 194 is provided as stated, 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 subchannel 160 to distribute ANCH 180, are not limited thereto, the number of the subchannel of being arranged 160 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 in the territory 192 different with the preset frequency territory, arranging 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 (like busy street); Distribute to the number of the subchannel 160 in preset frequency territory 190 through increase, can be when increasing the number that inserts simultaneously, not carry out stable communication almost there being ANCH 180 to break off under the situation about connecting.
In addition, can frequency band that distribute to preset frequency territory 190 (number of subchannel 160) be set to semifixedly the parameter of each base station 120.In addition, can change the number of subchannel, perhaps can come dynamically to change the number of subchannel according to the number that the terminal is inserted through 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.Carrier sense is carried out with CCH 184 adjacent PRU 170 (being the PRU170 in preset frequency territory 190) in 120 pairs of base stations, and ANCH 180 distributed to has 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, confirms 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 through obtaining EXCH 182 according to mapping included among the ANCH that is read 180.Then, owing to extremely reduced interference to ANCH 180, thereby can carry out stable communication.
Although illustrated and described first exemplary embodiment of the present invention, self-evident ground the invention is not restricted to this embodiment.To those skilled in the art obviously, 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 the step in the wireless communications method of the present disclosure, can also carry out these steps concurrently or through 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.
< second exemplary embodiment >
Below will describe second exemplary embodiment of the present invention in detail with reference to accompanying drawing.In this embodiment, size, material, other appointment numerical value or the like only are the examples that provides from being convenient to complete understanding the object of the 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, comprising: 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 sketch map 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 through 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 to the communication access of communication peer through communication network 1130 to Relay Server 1140.Then; Relay Server 1140 is through 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 like ARIB STD T95 or PHS MoU and so on.In this embodiment; Through distributing the anchor channel to plan the improvement to communication stability, this anchor channel sends the control information like 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.
Whole base station 1120 is managed and controlled to base station controller 1210 through the semiconductor integrated circuit that comprises CPU (CPU).In addition, the program in the base station controller 1210 use base station stored devices 1212 is controlled the communication access of phs terminal 1110 or 1110 pairs of communication networks 1130 of other phs terminals.Base station stored device 1212 is made up of ROM, RAM, EEPROM, non-volatile ram, flash memory, HDD etc., and the program of handling in the storage base station controller 1210, temporal information etc.
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) comes dynamically to change the electric wave that will send/receive with zero through beam shaping.Here, beam shaping increases received-signal strength through adjustment 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 through 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 through communication network 1130.
In addition, in this embodiment, base station controller 1210 is also as channel-assignment unit 1220.
The PRU (physical resource unit) that 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) are distributed to 625 microsecond duration according to base band distance and time-division, defined by the band occupancy of 900kHz.
Fig. 7 is used to explain the view 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 to 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 arrives 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 to a phs terminal 1110.
Confirm through 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 to 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, the EXCH 1302a with the phs terminal 1110 that uses ANCH 1300a distributes 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, to 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 to being directed against each phs terminal 1110,, EXCH 1302 is distributed to different time-gap to each phs terminal 1110 with the configuration that ANCH 1300 distributes 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 through time division way (to each time slot) to each phs terminal 1110; Thereby the antenna 1218 formation beam shapings that can have the adaptive array function through use; Along predetermined direction electric wave is narrowed down, and can fall into and prevent and the disturbing of other base stations 1120 through 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 situation, wherein is assigned with the PRU that is arranged in the subchannel with control channel 1304 and does not communicate.Correspondingly, owing to PRU 1310b low the interference arranged, thereby can avoid the communication disruption that causes owing to interference through ANCH 1300 being distributed to corresponding PRU to ANCH1300 with the adjacent or approaching PRU 1310a of control channel 1304.
Fig. 8 A and 8B are the views that is used to explain the different operating of channel-assignment unit, show the situation that channel-assignment unit will be distributed to 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.Likewise, 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, through between phs terminal 1110 employed EXCH 1302a and EXCH 1302b, unappropriated PRU being provided, can avoid the overlapping of wave frequency and prevent interference therebetween.
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, can EXCH 1302a 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 through time division way (to each time slot) to 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 can the interference with other base stations 1120 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 confirming 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 through obtaining EXCH 1302 to communicate according to mapping included among the ANCH that is read 1300.Then, owing to extremely reduced interference to ANCH 1300, thereby can carry out stable communication.
Although illustrated and described the second embodiment of the present invention, self-evident ground the invention is not restricted to this embodiment.To those skilled in the art obviously, 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 the step in the wireless communications method of the present disclosure, can also carry out these steps concurrently or through 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 (4)
1. base station of using the OFDMA system to come to carry out radio communication with one or more terminal equipments, said base station comprises:
Channel-assignment unit; The extra channel that will be used for data communication to each said terminal equipment is given identical time slot included PRU with the corresponding anchor channel allocation of this terminal equipment with comprising in being mapped in; The position that is assigned with the PRU of employed this extra channel of this terminal equipment has been indicated in said mapping
Wherein, Said channel-assignment unit under the situation of the PRU that will give identical time slot to each said anchor channel allocation of a plurality of said terminal equipments, will to the said anchor channel allocation of a terminal equipment give with to the said extra channel of other-end equipment non-conterminous PRU also on frequency direction.
2. base station according to claim 1, wherein, said channel-assignment unit is given said anchor channel allocation and the adjacent or approaching PRU of control channel that is allocated in advance to the PDU of allocated frequency band.
3. base station according to claim 1 and 2 also comprises adaptive array antenna.
4. a wireless communications method that uses the OFDMA system adopts one or more terminal equipments and base station,
The extra channel that will be used for data communication to each said terminal equipment when said base station with comprise in being mapped in the corresponding anchor channel allocation of this terminal equipment during to the included PRU of identical time slot,
Said base station is under the situation of the PRU that will give identical time slot to each said anchor channel allocation of a plurality of said terminal equipments; Will to the said anchor channel allocation of a terminal equipment give with to the said extra channel of other-end equipment on frequency direction and non-conterminous PRU, the position that is assigned with the PRU of employed this extra channel of this terminal equipment has been indicated in wherein said mapping.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008-138473 | 2008-05-27 | ||
| JP2008138472A JP4588083B2 (en) | 2008-05-27 | 2008-05-27 | Base station and radio communication method |
| JP2008138473A JP4654267B2 (en) | 2008-05-27 | 2008-05-27 | Base station and radio communication method |
| JP2008-138472 | 2008-05-27 | ||
| JP2008138472 | 2008-05-27 | ||
| JP2008138473 | 2008-05-27 |
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| CN101594684A CN101594684A (en) | 2009-12-02 |
| CN101594684B true 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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| 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 |
| JP5620888B2 (en) * | 2011-07-26 | 2014-11-05 | 京セラ株式会社 | Radio 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 |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1765096A (en) * | 2003-04-23 | 2006-04-26 | 意大利电信股份公司 | Wireless telephone network with multi-carrier packet data transmission |
| CN1898887A (en) * | 2003-10-24 | 2007-01-17 | 高通股份有限公司 | Local and wide-area transmissions in a wireless broadcast network |
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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 |
| 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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1765096A (en) * | 2003-04-23 | 2006-04-26 | 意大利电信股份公司 | Wireless telephone network with multi-carrier packet data transmission |
| CN1898887A (en) * | 2003-10-24 | 2007-01-17 | 高通股份有限公司 | Local and wide-area transmissions in a wireless broadcast network |
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| CN101594684A (en) | 2009-12-02 |
| JP4588083B2 (en) | 2010-11-24 |
| JP2009290339A (en) | 2009-12-10 |
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