JP2011166274A - Mobile wireless communication system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent handover failure generated when a mobile station moves, as well as interference between base stations in a cellular system. <P>SOLUTION: In a mobile wireless communication system which includes a plurality of base stations (3) that communicate with mobile stations (4) and base station grouping transmission controllers (1 and 2) that group the base stations and transmit data to them, the base station grouping transmission controller has a grouping information collector (7) that collects grouping information for grouping the base stations, and a group generator (8) that generates one or more base station groups including a plurality of base stations based on the collected grouping information. The plurality of base stations which belong to one base station group transmit the same transmission control signal (42) to instruct mapping of a wireless frame (25) with synchronizing each other to one of mobile stations, which is in a coverage area of the base station group. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention relates to a mobile radio communication system that performs autonomous cell adjustment.

  The WiMAX / Advanced WiMAX and LTE / LTE-Advanced systems that make up IMT (International Mobile Telecommunication) and IMT-Advanced perform self-optimization of cells using the SON (Self-Organizing Network) function. .

  Cell self-optimization control is achieved by acquiring performance information and control information statistics from mobile devices and base stations using a SON server and controlling the operation of gateways and base stations according to control guidelines determined based on these statistics. To be implemented.

In 3GPP (3rd Generation Partnership Project), as shown in Non-Patent Document 1, standardization for automatically performing cell optimization is being promoted as “Coverage and capacity optimization”.

In addition, contributions have been issued for standardization, and as shown in Non-Patent Document 2, proposals for measures against coverage fall (dead zone) and cell interference have been made. In Non-Patent Document 2, the transmission power and antenna angle of each base station are determined based on information on success / failure of handover of a mobile station, measurement information (the reception level of the local station and the level of neighboring cells), location information of the mobile station, etc. It has been proposed to improve the coverage of each base station by adjusting.

3GPP TR 36.902: 3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Self-configuring and self-optimizing network use cases and solutions Coverage optimization 3GPP TSG RAN WG3 R3-080755 31st March-3rd April 2008

  The above-mentioned conventional SON technology is a cell self-optimization technology for macro base stations, and is trying to achieve optimization of cell coverage by adjusting antenna angles and the like. However, pico base stations and femto base stations that make up small cells (pico cells and femto cells), which are expected to increase with the introduction of LTE and LTE-Advanced, have a simple mechanism compared to macro base stations. There is a problem of requiring cell adjustment.

  An object of the present invention is to avoid self-optimization of cell coverage and to avoid interference between adjacent cells for the purpose of reducing the rate of handover occurrence that occurs according to the flow of a mobile station in a pico base station or femto base station. Wireless communication device consisting of SON server (autonomous cell adjustment device), MME (Mobility Management Entity) and gateway (user data transmission device), base station, mobile station to realize self-optimization of cell coverage The purpose is to obtain.

  In order to solve the above-described problem, in the present invention, a mobile radio including a plurality of base stations that communicate with a mobile station, and a base station grouping transmission control device that groups the base stations and performs data transmission to the base station In the communication system, the base station grouping transmission control apparatus includes a grouping information collecting unit that collects grouping information for grouping base stations, and a plurality of base stations based on the collected grouping information. A group generation unit that generates one or a plurality of base station groups, and a plurality of base stations included in one base station group are assigned to one mobile station existing within the coverage area of the one base station group. On the other hand, the same control signal is transmitted in synchronization with the transmission control signal instructing the mapping of the radio frame.

  According to the present invention, means for consolidating radio communication performance measured by a mobile station, radio communication performance measured by a base station, and mobile station information acquired by an MME / GW into a SON server that performs autonomous cell adjustment And means for generating a group cell composed of a plurality of cells based on information aggregated in the SON server, and map data and HARQ of burst data in a group cell composed of a plurality of cells according to an instruction from the SON server In the cell environment using a small cell such as a femto base station, it is possible to reduce the handover occurrence rate by providing means for enabling the diversity effect to be obtained by synchronizing the control channel information transmitted with the delivery confirmation information such as There is an effect that it is possible to increase coverage by avoiding inter-cell interference.

FIG. 1 shows a configuration of a wireless communication system that performs autonomous cell adjustment according to the first embodiment. FIG. 2 shows a subframe format targeted by the first embodiment. FIG. 3 shows the handover rate reduction effect in the first embodiment. FIG. 4 shows the coverage expansion effect in the first embodiment. FIG. 5 shows a configuration of a wireless communication system that performs autonomous cell adjustment according to the second embodiment. FIG. 6 is a cell configuration diagram showing the purpose of group cell adjustment according to the second embodiment. FIG. 7 is a cell configuration diagram illustrating the configuration after group cell adjustment according to the second embodiment. FIG. 8 shows a configuration of a wireless communication system that performs autonomous cell adjustment according to the third embodiment. FIG. 9 is a cell configuration diagram before group cell reconfiguration according to the third embodiment. FIG. 10 is a cell configuration diagram after the group cell configuration of the third embodiment. FIG. 11 shows a configuration of a wireless communication system that performs autonomous cell adjustment according to the fourth embodiment. FIG. 12 is a configuration diagram of a group cell according to the fourth embodiment. FIG. 13 shows transmission power and coverage before power adjustment according to the fourth embodiment. FIG. 14 shows transmission power and coverage after power adjustment according to the fourth embodiment. FIG. 15 shows a problem to be solved in the fifth embodiment. FIG. 16 shows an RRC configuration for control channel information synchronization according to the fifth embodiment. FIG. 17 shows a configuration of a MAC group control unit for control channel information synchronization according to the fifth embodiment. FIG. 18 shows a configuration for user burst synchronization for control channel information synchronization according to the fifth embodiment. FIG. 19 shows a configuration for control channel information synchronization using the group cell base station transmission control apparatus of the sixth embodiment. FIG. 20 is a subframe format for illustrating the PDCCH generation method of the sixth embodiment. FIG. 21 shows a 3GPP LTE subframe format to illustrate the problem of the seventh embodiment. FIG. 22 shows a subframe format for configuring a plurality of group cells according to the seventh embodiment. FIG. 23 shows a group configuration index for designating a group attribute for each subframe according to the eighth embodiment. FIG. 24 illustrates a subframe format that enables PDCCH setting for a plurality of group cells according to the ninth embodiment. FIG. 25 illustrates a subframe format that enables PDCCH configuration for a plurality of group cells according to the tenth embodiment. FIG. 26 illustrates a subframe format that enables RSSI measurement for a plurality of group cells according to the eleventh embodiment.

Embodiment 1 FIG.
FIG. 1 shows a configuration of a wireless communication system that performs autonomous cell adjustment in the first embodiment. The wireless communication system in FIG. 1 includes a SON (Self-Organizing Network) server 1 (hereinafter referred to as SON server 1), an MME / GW2 having a mobility management entity (MME) and gateway (GW) function, and a base. A station 3 (eNB: evolved Node B) and a mobile station 4 (UE: User Equipment) are included.

  The SON server 1 includes a SON information collection unit 7 that collects and statistics wireless transmission performance, user flow line information, base station load information, and user distribution information, and a SON group generation unit 8 that generates group cells for mobile groups and interference groups. Consists of The MME / GW 2 includes an MME / GW information collection unit 19 that collects user movement information and user distribution information, and an MME / GW group control unit 9 that performs RAB (Radio Access Bearer) management and highly reliable data transmission.

  The base station (eNB) 3 is a radio performance measurement result (mobile station measurement radio performance measurement result) measured at the mobile station, a radio performance measurement result (base station measurement radio performance measurement result) measured at the base station, and a handover. Base station information collection unit 20 that collects handover user information including success or failure, base station operation load information, accommodated user information such as the number of accommodated users, and the like, and a base station transmission control unit that performs transmission control through a radio interface with a mobile station 10. A base station group control unit 11 for synchronizing access information such as connection information and an uplink transmission request between base stations constituting a group cell.

  The mobile station (UE) 4 includes a mobile station transmission control unit 12 that performs radio transmission control with the base station 3, and performs handover control information and received power information (RSSI: Received Signal Strength Indicator) through a radio transmission control signal 15. The base station is notified of radio performance measurement results such as interference information (CINR: Carrier Interference Noise Ratio).

  The wireless communication device that performs autonomous cell adjustment configured as described above is collected through the collection information 13 collected by the MME / GW information collection unit 19, the wireless transmission control signal 15 between the mobile station 4 and the base station 3. In addition to the information, the collection information 14 collected by the base station information collection unit 20 of the base station 3 is collected in the SON server 1.

  The SON server 1 constituting the wireless communication system that performs autonomous cell adjustment of this embodiment is configured by a plurality of base stations based on information collected from these MME / GWs, base stations, and mobile stations. It is characterized by forming a group cell (mobile group, interference group). A moving group refers to a group cell that bundles a plurality of cells into one cell in accordance with a user's flow line (movement). The interference group refers to a group cell in which a plurality of cells that generate strong inter-cell interference are used as one group cell.

  FIG. 2 shows the configuration of LTE (Long Term Evolution) subframe 25 of 3GPP (3rd Generation Partnership Project) in order to explain the features of the present embodiment. The subframe 25 includes a data channel region 23 including user bursts, a PDCCH (Physical Downlink Control Channel) including mapping information of user bursts, a PCFICH (Physical Control Format Indicator Channel) transmitting feedback information, and HARQ (Hybrid ARQ). Control channel region 22 consisting of PHICH (Physical Hybrid ARQ Indicator Channel) for transmitting the delivery confirmation information.

The base stations of the cells constituting the group cell composed of a plurality of cells (individual cells) according to the present embodiment are characterized in that the information of the control channel region 22 is exactly the same and is transmitted in synchronization between the base stations. And In a group cell created in accordance with a user's flow line, it is possible to acquire the same control channel information regardless of which cell in the group cell the mobile device moves to. In a group cell configured for the purpose of avoiding interference, the control channel region 22 is interference-free (that is, signals from other individual cells in the same group cell do not interfere with the control channel 22). The coverage area can be increased by the diversity effect. In the present embodiment, PDCCH information for a plurality of group cells can be set in the control channel region 22.
The signal in the control channel region 22 in FIG. 2 corresponds to the transmission control signal in the present invention.

  FIG. 3 shows the effect of the group cell on the mobile group generated according to the user flow line in the wireless communication system that performs autonomous cell adjustment configured as described above. In FIG. 3, an example (26) configured by six single base stations of cell 28, cell 29, cell 30, cell 31, cell 32, and cell 33 and a group cell that is a feature of the present embodiment are configured. (27) shows the rate of handover occurrence. In a transmission system that creates different control channel regions independently of six base stations (26), handover occurs at the boundary of individual cells, and in the embodiment of FIG. 3, handover occurs three times in the user flow line (35). On the other hand, this embodiment uses group cell # 1 (36) composed of individual cell 38, cell 29 and cell 30, and group cell # 2 (37) composed of individual cell 31, cell 32 and cell 33. With this configuration, handover does not occur at the individual cell boundary, but handover occurs at the boundary between group cell # 1 (36) and group cell # 2 (37) (38), so the number of handovers should be reduced to one. Can do. In this way, it is possible to reduce the handover occurrence rate in IMT-Advanced where a small cell such as a femto base station is introduced.

  FIG. 4 shows the effect when a group cell is constructed for the purpose of avoiding interference in the wireless communication system that performs autonomous cell adjustment configured as described above. In Fig. 4, when base station # 1 (41), base station # 2 (42), and base station # 3 (43) transmit independently (39), the transmission power is 100 mW, the path loss model IMT Advanced Urban Micro NLOS (Non Line of Site) CINR (Carrier Interference Noise Ratio) 1dB line is shown as black line 44, and CINR under the same condition when group cell is composed of 3 base stations and the same control channel information is transmitted (40) A 1 dB line is indicated by a black line 45. In an area of 400m × 400m, when the three base stations transmit independently (39), the coverage area (the sum of the areas inside the CINR 1 dB line for base stations # 1, # 2, and # 3) is 11%. However, the coverage area (CINR 1 dB line = area inside the black line 45) when a group cell is configured with three base stations is 25% coverage due to the macro diversity effect. Thereby, by configuring a group cell by autonomous cell adjustment, it is possible not only to eliminate inter-cell interference, but also to expand a coverage area by a diversity effect.

  The radio communication system that performs autonomous cell adjustment according to the present embodiment reduces handover frequency and reduces coverage particularly for the problem of increased handover frequency and interference area due to cell miniaturization (picocell, femtocell). Has the effect of increasing.

Embodiment 2. FIG.
In the second embodiment, in the radio communication system that performs autonomous cell adjustment according to the first embodiment, the SON server is characterized by optimizing the group cell using the statistical information of the handover failure rate explain.
The basic configuration of the entire system in this embodiment is the same as that in FIG. 1, and only the portions necessary for the description of this embodiment will be described.

FIG. 5 shows a SON server that adjusts the group cell configuration according to the statistical information of the handover success rate. In FIG. 5, the SON server 1 generates a wireless group performance information (RSSI, CINR measurement value) 46, a SON information collection unit 7 that collects user flow line information 47, and a movement group 52 including a plurality of cells, and adjusts the SON. It consists of a group generation unit 8. The radio transmission performance unit 48 of the SON information collection unit performs time statistical processing on the CINR distribution 50 for RSSI.

When SON information collection unit 7 is notified of handover failure 49 as handover information 48 from base station 3, CINR time statistical distribution corresponding to RSSI collected for the base station on the user flow line adjacent to that base station 50 is notified to the SON group generation unit 8. The SON group generation unit 8 confirms the CINR distribution (50) with respect to the RSSI of the border cell of the group cell that failed to perform the handover, and shows a high RSSI (predetermined RSSI) and a high CINR (predetermined CINR) distribution. If so, it is determined that the coverage of the border cell is small, and the border cell is adjusted.

6 and 7 show an example in which the handover success rate is improved by adjusting the boundary cell of the group cell. In FIG. 6, a cell 53 and a cell 54 constitute a group cell # 1 (59), and a cell 55, a cell 56, and a cell 57 constitute a group cell # 2 (60). Cell 54 and cell 55 on user flow line 58 are the boundary cells of group cell # 1 (59) and group cell # 2 (60), and coverage area of cell 54 is reduced due to strong interference from neighboring cells. Shows the case. Cells with degenerate coverage show a high RSSI and high CINR distribution. FIG. 7 shows the result after adjusting the border cells of the group cell. The SON group generation unit 8 of the SON server 1 examines a cell which is adjacent to the cell 54 on the user flow line and shows a high CINR distribution with a low RSSI or a high RSSI and a low CINR distribution than the cell 54, and reconfigures the group cell I do. As a result, the handover success rate can be improved by selecting the cells 55 and 56 having a larger coverage area shown in FIG. 7 as the boundary cells of the group cells.
That is, the cell group is reconfigured using RSSI and CINR in at least one of the base station corresponding to the cell 54 and the base station corresponding to the cell 55.

The group cell # 1 (59) and the group cell # 2 (60) are respectively a first base station group and a second base station group in the present invention, and base stations corresponding to the cells 55 and 56 are These are the first boundary base station and the second boundary base station in the present invention, respectively.

As described above, in the present embodiment, an example has been described that includes a group cell adjustment mechanism characterized by improving the handover success rate by selecting a boundary cell of a group cell using CINR statistical information for RSSI. .
In the above description, RSSI and CINR are used when changing the cell group configuration. However, the present invention is not limited to these, and other parameters may be used as long as the wireless transmission performance information correlates with the cell size. May be. Further, the border cells may be shifted by one or a predetermined number by trial and error without using the wireless transmission performance information. In this case, it takes time to configure an appropriate cell group, but the apparatus configuration is simplified.

Embodiment 3 FIG.
FIG. 8 shows a configuration of a SON server characterized in that, in the wireless communication system that performs autonomous cell adjustment according to the first embodiment, group cells are optimized according to the load of the base station.
The configuration of the entire system in this embodiment is the same as that in FIG. 1, and only the portions necessary for the description of this embodiment will be described.

In FIG. 8, the SON server 1 includes a base station load information unit 65 that receives a radio frame usage rate 67 indicating the load information of the base station 3 as a radio frame usage rate message 66, and a SON group that generates and adjusts group cells. The base station load information collection unit 65 of the SON information collection unit 7 includes a generation unit 8 and takes time statistics of the radio frame utilization rate 63.

Here, the radio frame utilization rate is the maximum number of symbols that can be transmitted in a frame transmitted within a predetermined time to all (or any one of a plurality of base stations) of cells constituting a cell group. The ratio of the sum and the sum of the number of symbols actually used for data transmission in all the transmission frames is calculated and calculated for each group cell. Hereinafter, this radio frame usage rate is referred to as a group radio usage rate.
Alternatively, the radio frame utilization rate means that when data is transmitted to one base station within a predetermined time, it is transmitted within a frame transmitted during this time (for example, consisting of a series of subframes 25 shown in FIG. 2). The ratio of the maximum possible number of symbols to the number of symbols actually used for data transmission is calculated for each base station. Hereinafter, this radio frame usage rate may be referred to as a single radio frame usage rate.

In the group cell, in order to make the control channel (PDCCH) (FIG. 2) the same, it is necessary to adjust the number of cells constituting the group cell and the selected cell in accordance with the total traffic capacity of the group cell. The base station load information unit 65 of the SON information collecting unit confirms the radio frame usage rate 63, and confirms that the radio frame usage rate of the group cell is larger than the maximum radio frame usage rate 64 which is a predetermined value. Time statistics.
The radio frame utilization rate 63 in the present embodiment may be either the above-described single radio frame utilization rate calculated with one base station in the group cell as a representative or the above-described group radio frame utilization rate.

FIG. 9 and FIG. 10 show the cell configuration near the intersection of roads, and show the effect of reconfiguring the group cell according to the radio frame utilization rate of the group cell. In FIG. 9, group cell # 1 (80) is composed of cell 68, cell 69, cell 70, cell 71, cell 72, cell 73, cell 74, cell 75, cell 76, cell 77, and cell 78. In FIG. 10, group cell # 1 (81) is composed of cell 68, cell 69, cell 70, cell 71, cell 72, cell 73 and cell 74, and group cell # 2 (82) is composed of cell 75, cell 76. Cell 77, cell 78, and cell 79.

A group cell # 1 (80) shown in FIG. 9 is configured in a time zone in which there is little traffic at night and there is a small amount of communication traffic. Daytime traffic increases and the number of vehicles that stop at the intersection increases, and the communication traffic of cells 75, 76, 77, 78, and 79 increases. The SON information collection unit 7 collects statistics of the radio frame utilization rate of the group cell # 1 (80), examines the time zone exceeding the maximum radio frame utilization rate 64, and moves the mobile group 52 of the SON group generation unit 8 at a predetermined time. To notify the group cell reconfiguration.

Here, in the present embodiment, since the location of the mobile station is controlled in units of group cells, the presence of the mobile station is not recognized solely by the base stations constituting the group cell. Therefore, the SON server (1) of the present embodiment uses the result of the peripheral level measurement notified from the mobile stations located in the cells constituting the group cell, and the mobile station exists in the cell with the highest level. The base station of the cell in which many mobile stations exist is separated, and group cell division is performed. Here, “peripheral level measurement results” mean RSSI and CINR measurement results, or channel capacity correlated with these, and the base station accommodates RSSI and SINR measurement results at each mobile station. The number of mobile stations can be calculated. The procedure for notifying the SON server 1 of the result of the peripheral level measurement is as follows: (a) the mobile station transmission control unit 12 of the mobile station 4 measures, and (b) the base station transmission control unit 10 of the base station 3 receives information. (C) is performed according to the procedure of “the SON information collecting unit 7 of the SON server 1 collects the information. The existence of the mobile station is determined after the information is collected by the“ SON information collecting unit 7 ”. Either the “SON group generation unit 8” is instructed to divide, or the “SON information collection unit 7” only collects information and the “SON group generation unit 8” determines based on the information. It becomes.

In FIG. 10, as a result of the peripheral level measurement, the level measurement results of the cell 75, the cell 76, the cell 77, the cell 78, and the cell 79 are high, and the SON server (1) has the cell 75, the cell 76, the cell 77, and the cell 78. Then, it is determined that the number of users in the cell 79 is large, and by making these cells independent as group cell # 2 (82), it is possible to adjust the traffic in the group cell.

As described above, according to the present embodiment, it is possible to optimize the group cell by using the RSSI and CINR measurement results of the mobile station based on the radio frame utilization rate that is an index of the load level of the base station. And That is, by observing the magnitude of the load related to one base station group, and when the magnitude of the load exceeds a predetermined value, by separating a part of the base stations included in this base station group, this base station group Optimize group cells.

  In the above embodiment, the radio frame utilization rate is used as an index of the magnitude of the load on the base station, but the number of mobile stations accommodated in a cell of a predetermined base station may be used. The number of mobile stations accommodated can be calculated from the measurement result of RSSI measured by the mobile station.

  Moreover, although the example which implements the division of the group cell using the result of the peripheral level measurement notified from the mobile station is shown in the above embodiment, the radio frame utilization rate in each base station may be used.

Embodiment 4 FIG.
FIG. 11 shows an embodiment in which, in the wireless communication system that performs autonomous cell adjustment according to the first embodiment, load adjustment of a cell that belongs to a group cell and also functions as a single cell is performed by power control.
The configuration of the entire system in this embodiment is the same as that in FIG. 1, and only the portions necessary for the description of this embodiment will be described.

In FIG. 11, the SON server 1 collects the load information of the group cell from the base station 3, and the base station load information unit 65 of the SON information collection unit 7 of the SON server 1 determines the base station load status in the group. , Adjust the transmission power of the base station.
As the parameter indicating the cell load status in this embodiment, the radio frame utilization rate and the number of mobile stations in the area described in the third embodiment can be used.

A base station corresponding to one cell functions as a base station of a cell constituting a group cell for a mobile station moving at high speed on a flow line, and at the same time, for a mobile station that does not move or has a low moving speed. Can function as a base station of a single cell that does not constitute a group cell.
For example, when the load factor of the base station of the cell 71 belonging to the group cell # 1 in FIG. 12 and functioning as a single cell becomes high and exceeds a predetermined value, the SON server 1 does not change the cell coverage of the group cell. In order to reduce the number of mobile stations belonging to a single cell, transmission power control of the cell 71 is performed. For mobile stations belonging to a single cell, not all base stations in the group cell transmit the same signal, but only the base station of that single cell transmits.

  FIGS. 13 and 14 show the operation of this embodiment. In FIG. 13, base station # 71 (71) belonging to group cell # 1 (86) and also belonging to a single cell is similarly assigned to base station # 72 belonging to group cell # 1 (86) and also belonging to a single cell. (72) and transmission with the same transmission power. In this case, the cell boundary is the cell boundary # 1 (88) in the middle of the base station. In FIG. 14, in order to reduce the load factor in the single cell of base station # 71 (71), the transmission power of base station # 71 is lowered (90), so that the coverage area of base station # 71 is changed to cell boundary # 2 (91 ). As a result, the mobile station accommodated in the base station # 71 (71) serving as the base station of the single cell is handed over to the base station # 72 (72) serving as the base station of the single cell. 71) and the load factor of the single cell of base station # 71 can be reduced. On the other hand, the coverage area as a group cell in which the base stations # 71 and # 72 are combined can maintain the same size coverage area due to the diversity effect.

  This makes it possible to adjust the load factor of the base station by adjusting the coverage of the single cell without reducing the coverage area of group cell # 1 (86).

Embodiment 5 FIG.
In the radio communication system that performs autonomous cell adjustment according to the first embodiment, an embodiment for generating exactly the same control channel information (such as PDCCH) in the base stations of the cells constituting the group cell will be described. In this embodiment, a method of synchronizing control channel information (such as PDCCH) only with the MME / GW and the base station without using an integrated transmission control apparatus is shown.
The configuration of the entire system in this embodiment is the same as that in FIG. 1, and only the portions necessary for the description of this embodiment will be described.

  FIG. 15 shows a problem for generating the same control channel information in the group cell shown in the present embodiment. In FIG. 15, the MME / GW 2 is composed of an RAB (Radio Access Bearer) management 92 and a data transmission unit 93, and the base station (eNB) 3 has an RRC (Radio Resource Control) 95, PDCP 94, It consists of RLC (Radio Link Control) 96 that controls the radio link, MAC (Medium Access Control) 103 that performs medium access control, and HARQ 104 that performs error correction and retransmission processing. The mobile station (UE) 4 includes RRC 108, PDCP (Packet Data Convergence Protocol) 109, RLC110, MAC111, HARQ112. Control channel information (such as PDCCH) is generated by the MAC 103 of the base station 3. In the control channel information generated by the MAC, the IP traffic 98 transmitted from the RRC message 97 and the PDCP 94 is segmented by the RLC layer and transmitted to the MAC 103 as a new RLC (Radio Link Control) PDU (Protocol Data Unit) and HARQ ( Hybrid Automatic Repeat Request) is transmitted as a burst. Also, the RLC 96 transmits an RLC retransmission PDU to the MAC 103 and transmits it in a HARQ burst based on acknowledgment of the RLC layer. Also, the HA103 104 to MAC103 layer receives the downlink HARQ delivery confirmation notification and retransmits the HARQ burst as necessary. Further, the MAC 103 receives the uplink HARQ burst and generates a PDCCH information element for the data burst area for retransmission of the uplink HARQ burst as necessary. Further, when receiving the uplink transmission request 107 from the MAC 111 of the mobile station 4, the base station 3 generates a PDCCH information element for giving an uplink transmission opportunity.

  In this way, since control channel information (PDCCH) is generated by RRC transmission, PDCP transmission, RLC retransmission, HARQ delivery confirmation, HARQ reception, and MAC transmission request, a group cell consisting of multiple cells of this embodiment is constructed. It is necessary to share these information in the base station to synchronize transmission opportunities.

  FIG. 16 shows a mechanism for synchronizing RRC messages for generating exactly the same control channel information (such as PDCCH) in the base stations of the cells constituting the group cell shown in the present embodiment.

  In FIG. 16, MME / GW2 is composed of RAB management 92 and data transmission unit 93, base station 3 is composed of RRC95, PDCP94, RRC group control unit 114, RLC96, MAC103, HARQ104, and mobile station 4 is It consists of RRC108, PDCP109, RLC110, MAC111, and HARQ112. Base stations 117 belonging to the same group cell have the same configuration as base station 3. The RAB (Radio Access Bearer) management 92 of the MME / GW establishes RAB connections (113, 115) and RRCs (95, 118) of base stations that construct a group cell. At this time, the RAB identifier for identifying the RAB connection has the same value for the RAB connections (113, 115) of a plurality of base stations belonging to the group cell.

  Therefore, the RAB management unit 92 of the MME / GW2 of the present embodiment, through the RAB connection to each base station of the group cell, specifies the message execution time using the frame number synchronized with all the base stations. Send. When the RRC (95, 118) of the plurality of base stations belonging to the group cell receives the RAB message, the RRC message processing is executed in synchronization with the specified time, thereby lowering the RRC message generated by the RRC. It is possible to synchronize the layer transmission timing.

In addition, when the base station 3 in which the mobile station 4 is located receives the RRC message from the mobile station 4, the RRC group control unit 114 acquires a message to be transmitted to the RRC 95 after assembling the PDU by RLC. The RRC group controller 114 designates the execution time of the message as a frame time and transfers it to a plurality of base stations in the group cell (116).

  Thus, even in the base station 117 where the mobile station 4 is not located, the RRC message from the mobile station is received from the RRC group control unit 114 of the base station 3 where the mobile station 4 is located, so that the mobile station 4 is present. It becomes possible to execute exactly the same RRC protocol as the base station 3 that is in service in a specified time.

  FIG. 17 shows a mechanism for synchronously executing PDCCH information generated by an uplink bandwidth request from a mobile station at a plurality of base stations included in the group cell. In FIG. 17, in addition to the configuration of FIG. 16, a MAC group control unit (132, 133) is provided in the base station (3, 117).

  When receiving the upstream bandwidth request 107 (upstream transmission opportunity request) from the mobile station 4, the MAC group control unit 132 of the base station 3 in which the mobile station 4 is located designates the execution time of this bandwidth request by a frame number. The MAC group control unit 133 of the base station 117 included in the group cell is notified (124). The MAC group control unit 133 notifies the MAC 128 of the uplink bandwidth request at the designated time.

  This enables simultaneous generation of PDCCH information for uplink burst transfer by UL band request at a plurality of base stations included in the group cell.

  FIG. 18 shows a mechanism for synchronizing control channel information (PDCCH) of data bursts in the user plane. In FIG. 18, the RAB management 92 of the MME / GW passes the RAB connection (108, 115) to the RRC (95, 118) of the base station (3, 117), and the RLC delivery confirmation mode and PDU (Packet Data Unit). Control information for specifying the DTCH modulation degree to the size and MAC is notified. Further, the MME / GW high-reliability data transmission unit 9 performs high-reliability data transmission using an encoded packet using the erasure correction code. The RRC (95, 118) of the base station 3 indicates the RLC delivery confirmation mode and the RLC PDU size using the CRLC_CONFIG_REQ message (134, 137). The RRC (95, 118) of the base station 3 instructs the MAC on the modulation degree and the burst size using the CMAC_CONFIG_REQ message (139, 140).

  For base stations belonging to group cells, the RAB92 of the MME / GW sets the RLC operation mode to the non-delivery confirmation mode, sets the RLC PDU size to a fixed length, sets the adaptive modulation degree in MAC to the fixed modulation degree mode, and adjusts the modulation degree. The control information for designating the error correction rate and the burst length is notified to the RRC (95, 118) through the RAB connection (108, 115). The RRC uses the CRLC_CONFIG_REQ message (134, 137) to set a non-delivery confirmation mode in which retransmission control is not performed for the DTCH (Dedicated Transport Channel) of the mobile station 4 belonging to the group cell, and the RLC PDU size is fixed. Specify the size so that As a result, RLC PDUs having the same size and the same data are transmitted from the RLCs of all base stations belonging to the group cell to the MAC.

Also, RRC (95, 118) uses CMAC_CONFIG_REQ (139, 140) message to specify non-delivery confirmation mode as HARQ operation mode for DTCH of mobile station 4 belonging to group cell for MAC, and fixed error Specify the correction rate and burst size. This enables transmission of HARQ bursts of the same size with the same data in all base stations belonging to the group cell.

Furthermore, since the base station belonging to the group cell according to the present embodiment does not use retransmission control of RLC and HARQ for mobile stations belonging to the group cell, the reliable data transmission 93 of the MME / GW2 uses an erasure correction code. Highly reliable data transmission is realized by performing the encoded packet transmission used. At this time, the MME / GW 2 synchronizes the HARQ burst transmission timing of the MAC (103, 128) of the base station belonging to the group cell by designating the transmission timing of the first packet of the encoded packet by the frame number of the base station. . Since the HARQ burst is constructed in the base station by the same scheduling algorithm in the subsequent encoded packet, the transmission timing of the subsequent encoded packet can be synchronized by synchronizing the transmission timing of the first encoded packet.

  In this way, RRC messages, uplink bandwidth requests, and data transmission on the user plane can be synchronized with all base stations constituting the group cell, thereby controlling subframes at all base stations constituting the group cell. Enables synchronous transmission of channel (PDCCH).

Embodiment 6 FIG.
In the radio communication system that performs autonomous cell adjustment according to the first embodiment, an embodiment for generating exactly the same control channel information (such as PDCCH) in the base stations of the cells constituting the group cell will be described. The configuration of the entire system in this embodiment is the same as that in FIG. 1, and only the portions necessary for the description of this embodiment will be described.
In this embodiment, in base stations of cells existing in a plurality of groups, control channel information (PDCCH) of mobile stations belonging to the group cell is generated by an integrated functional unit, and the mobile stations belonging to the individual base stations A hybrid configuration in which the control channel information (PDCCH) is generated and combined at the base station is used.

FIG. 19 shows that the base station belonging to a group cell and a single cell synchronizes the control channel region including the PDCCH in a configuration in cooperation with the group cell base station transmission control apparatus 143 in all base stations constituting the group cell. The mechanism for this is shown. In FIG. 19, an MME / GW (142) is connected to a base station (148, 149), and is connected to a group cell base station transmission control device 143 to perform transmission control for mobile stations belonging to the group cell. The group cell base station transmission control apparatus includes a high-reliability data transmission unit 144, PDCP145, RRC144, RLC147, and MAC147, and executes radio transmission control processing for mobile stations belonging to the group cell. The base stations (148, 149) are divided into group cell base station transmission control units (150, 162) and cell base station transmission control units (155, 167). The group cell base station transmission control unit (150, 162) is composed of a group cell MAC processing unit (151, 163) and a HARQ unit (UM: non-delivery confirmation mode) (152, 164), and forms a single cell. The station transmission control 155 includes PDCP (156, 168), RRC (157, 169), RLC (148, 170), MAC (159, 171), and HARQ unit (AM) (160, 164).

The group cell base station transmission control device 142 performs transmission synchronization between the RRC message and the user data with respect to the base stations constituting the group cell, so that the group control base station transmission control device (142) and the RRC (144) The PDCP (145) process is executed, and the PDCCH is generated by the MAC (147) of the group cell base station transmission control device (142). Also, in order to avoid short-term retransmission processing synchronization between a plurality of base stations constituting a group cell, a highly reliable data transmission unit 143 using an erasure correction code is arranged in the group cell base station transmission control device, The RLC (146) of the control base station transmission control device (142) is operated in the non-delivery confirmation mode. Further, the RRC 144 of the group control base station transmission control device (142) includes the base station (148, 163) constituting the group cell in the group cell MAC processing unit (151, 163) of the base station (148, 149) constituting the group cell. 149) HARQ (152, 164) is set to the non-delivery confirmation mode, and notification is made using the CGroup_MAC_Config_Req message (174, 175) in order to make the HARQ burst size, modulation degree, and error correction rate the same. When the base station (148, 149) receives the CGroup_MAC_CONFIG_Req message (174, 175) from the RRC 144 of the group cell base station transmission control device 142, it confirms the non-delivery according to the configuration specified in the message to the HARQ unit (152, 164). Set the operation mode, burst size, modulation factor, and error correction rate.

The group cell MAC processing units (151 and 163) of the base stations (148 and 149) constituting the group cell receive the MAC PDU (Protocol Data Unit) and PDCCH information of the group cell from the group cell base station transmission control device 142. Upon reception, the PDCCH information area for the group cell is subtracted from the control channel area 22 of the subframe 25 in FIG. 20 to calculate the PDCCH area (177) usable in the single cell, and the single cell base station transmission control unit ( 155, 167) MAC (159, 171). When the MAP generation unit (161, 172) of the MAC (159, 171) of the single cell base station transmission control unit (155, 167) receives the PDCCH region size information available in this single cell, it can only be used within this size. Build PDCCH (177) for the cell.

When the group cell MAC processing units (151 and 162) of the group cell base station transmission control unit (150 and 162) receive an uplink bandwidth request from a mobile station belonging to the group cell, the group cell base station transmission control unit (150 and 162) The MAC 147 is notified, mobile station uplink band allocation is performed, and a PDCCH information element for group cell for uplink burst is generated.

  Thus, a hybrid in which transmission control of mobile stations belonging to a group cell is performed by the group cell base station transmission control device 142, and transmission control of mobile stations belonging to a single cell is executed by the cell base station transmission control device (155, 167). PDCCH construction by configuration is possible, and PDCCH synchronization and construction of PDCCH by a single cell are possible at base stations belonging to a group cell.

Embodiment 7 FIG.
In the radio | wireless communications system which performs the autonomous cell adjustment which concerns on the said Embodiment 1, the radio | wireless transmission control system of the base station which constructs | assembles a some group cell is shown. In the present embodiment, a base station that can belong to a plurality of group cells is formed using an LTE synchronization scheme. The configuration of the entire system in this embodiment is the same as that in FIG. 1, and only the portions necessary for the description of this embodiment will be described.

  FIG. 21 shows a synchronization scheme in 3GPP LTE. In FIG. 21, one radio frame is composed of 10 subframes from subframe # 0 to subframe # 9, and establishes synchronization and acquires a synchronization ID (Primary Synchronization Signal and Secondary Synchronization Signal). ) (181, 183) are arranged in subframe # 0 (178) and subframe # 5 (179). Also, broadcast information (PBCH: Physical Broadcast Channel) (182) of the cell is arranged immediately after the synchronization channel of subframe # 0 (178). The mobile station synchronizes with the synchronization channel (181, 183), derives a cell ID, and acquires a scramble pattern and a pseudo sequence, which are physical layer parameters necessary for decoding the control channel.

  The base station constituting a plurality of group cells according to the present embodiment is characterized in that subframes are used in a time division manner for each group cell shown in FIG. 22 based on the radio frame. In FIG. 22, one radio frame (10 ms) is divided into a subframe section (184) of group cell # 1 and a subframe section (185) of group cell # 2.

As in the conventional method above, the synchronization channel is set in subframe # 0 (186) and subframe # 5 (187), and the cell ID of group cell # 1 is set in the synchronization channel (189) of subframe # 0 (186). The synchronization signal consisting of the cell ID of the group cell # 2 is set in the synchronization channel (191) included in the subframe # 5 (187).

Also, immediately after the synchronization channel (189) of subframe # 0 (186), broadcast information (PBCH) (190) of group cell # 1 is set, and the synchronization channel (191) of subframe # 5 (187) is set. Immediately thereafter, broadcast information (PBCH) (192) of group cell # 2 is set.

Group cell # 1 and group cell # 2 can be set as single cells. However, when the single cell of group cell # 1 and group cell # 2 uses the same cell ID, broadcast information (PBCH) (192) of subframe # 5 (187) is omitted.

In this way, by setting the synchronization channel including the cell IDs of the group cell # 1 and the group cell # 2, and setting the broadcast information of the group cell # 1 and the group cell # 2, one base station has two group cells. It is possible to cope with.
Embodiment 8 FIG.

In the seventh embodiment, one base station can belong to two group cells. In this embodiment, the number of subframes belonging to each group can be changed according to the radio usage rate for each group cell. It is characterized by that. The configuration of the entire system in this embodiment is the same as that in FIG. 1, and only the portions necessary for the description of this embodiment will be described.

In the broadcast information (PBCH) (190, 192) of each radio group, a group configuration index indicating a group attribute for each subframe shown in FIG. 23 is set.

In the group structure index 0 (193), subframes 0 to 4 are group cell # 1 (G1), and subframes 5 to 9 are group cell # 2 (G2). In the group structure index 1 (194), subframes 0 to 3 are group cell # 1 (G1), and subframes 4 to 9 are group cell # 2 (G2). In the group structure index 2 (195), subframes 0 to 2 are group cell # 1 (G1), and subframes 3 to 9 are group cell # 2 (G2). In the group configuration index 3 (196), subframes 0 to 1 are group cell # 1, and subframes # 2 to # 9 are group cell # 2 (G2). In the group structure index 4 (197), subframes 0 to 4 and subframe 9 are group cell # 1 (G1), and subframes 5 to 8 are group cell # 2 (G2). In the group structure index 5, subframes 0 to 4, subframes 8 and 9 are group cell # 1 (G1), and subframes 5 to 7 are group cell # 2. In the group structure index 6 (199), subframes 0 to 4 and subframes 7 to 9 are group cell # 1, and subframe 5 and subframe 6 are group cell # 2.

As described above, by notifying the subframes belonging to each group by the group configuration index using the broadcast information, the subframe configuration can be changed according to the load factor for each group cell.

Embodiment 9 FIG.
In the radio | wireless communications system which performs the autonomous cell adjustment which concerns on the said Embodiment 1, the radio | wireless transmission control system of the base station which constructs | assembles a some group cell is shown.
The configuration of the entire system in this embodiment is the same as that in FIG. 1, and only the portions necessary for the description of this embodiment will be described.
The base station of this embodiment has a PDCCH that applies scrambling and pseudo-sequences using different cell IDs for each group cell, and is characterized by sharing a radio subframe in units of physical resource units.

  FIG. 24 shows a subframe configuration in the present embodiment. In FIG. 24, a control channel composed of 3 symbols includes a PDCCH (200) for group cell # 1 to which scramble and pseudo sequence are applied using cell ID # 1, and scramble and pseudo using cell ID # 2. The PDCCH (201) for group cell # 2 to which the sequence is applied is divided. In addition, the PDCCH (200) for group cell # 1 maps the data burst of group cell # 1 to which the pseudo sequence is applied by scrambling with cell ID # 1 in group cell # 1 region (202). The PDCCH (201) for the group cell # 2 is scrambled with the cell ID # 2 in the group cell # 2 region (203), and the data burst of the group cell # 2 to which the pseudo sequence is applied is mapped.

  In addition, the PDCCH (201) of group cell # 2 can also set a PDCCH for a single cell, and the PDCCH for a single cell is scrambled using the cell ID of the single cell and applies a pseudo sequence. The data burst to be mapped can be mapped to the area for group cell # 2.

  Furthermore, it is possible to set PDCCH of two or more group cells, and to perform mapping of data bursts belonging to a plurality of groups.

  Thus, by enabling the setting of PDCCH belonging to a plurality of group cells, one base station can transmit data bursts of a plurality of group cells.

Embodiment 10 FIG.
In the radio | wireless communications system which performs the autonomous cell adjustment which concerns on the said Embodiment 1, the radio | wireless transmission control system of the base station which constructs | assembles a some group cell is shown.
The configuration of the entire system in this embodiment is the same as that in FIG. 1, and only the portions necessary for the description of this embodiment will be described.
The base station of this embodiment is characterized in that PDCCH information of different group cells and a cell ID are included in the PDCCH of the group cell.

  FIG. 25 shows an embodiment in which PDCCH information elements of different group cells can be set in the PDCCH of group cells. In FIG. 25, the scramble and pseudo sequence are applied to the PDCCH (204) of the group cell # 1 using the cell ID of the group cell # 1. The PDCCH information element (205) of group cell # 2 is set in the PDCCH (204) of group cell # 1. The PDCCH information element of group cell # 2 includes the cell ID of PDCCH # 2. The PDCCH of group cell # 1 maps the data burst of group cell # 1 to the group cell # 1 area (206), and applies the scrambling and pseudo sequence of cell ID # 1 to the radio frame. The PDCCH information element (205) of the group cell # 2 included in the PDCCH (204) of the group cell # 1 maps the data burst of the group cell # 2 to the group cell # 2 area (207), and the group cell # 2 Data burst is scrambled using the cell ID # 2 specified by the PDCCH information element (205), and the pseudo sequence is applied to the group cell # 2 area (207).

  Further, PDCCH information elements of a plurality of group cells can be set in the PDCCH (204) of group cell # 1. Further, the group cell information element included in the PDCCH of group cell # 1 may be a PDCCH information element of a single cell.

  As described above, by setting PDCCH information elements of a plurality of group cells in the PDCCH of the group cell, it is possible to transmit data bursts of a plurality of groups using different cell IDs in one base station.

Embodiment 11 FIG.
In Embodiments 9 and 10 described above, an embodiment relating to a measurement method of RSSI (Received Signal Strength Indicator) of a terminal station belonging to group cell # 2 (200, 205) is shown.
The configuration of the entire system in this embodiment is the same as that in FIG. 1, and only the portions necessary for the description of this embodiment will be described.

  FIG. 26 shows a subframe configuration for performing RSSI measurement in a terminal station belonging to group cell # 2. In FIG. 26, subframe # 0 (208) includes a synchronization channel (211) and broadcast information (PBCH) (212) of group cell # 1. Subframe # 5 (209) includes the synchronization channel of group cell # 1. Therefore, the mobile station included in the group cell # 1 performs RSSI and CINR measurement using the synchronization channel (211 and 213).

  In this embodiment, all base stations included in the group cell configure the synchronization channel (211 and 213) using the same CID, so that the transmission quality of each base station in the group is set to the synchronization channel (211 and 213). Cannot be measured using Therefore, the sounding signal (214) for group cell # 2 is set in subframe # 9.

  Sounding Thing can be set to an arbitrary symbol in an arbitrary subframe. Also, base stations corresponding to a plurality of group cells set sounding signals according to the number of groups. With the sounding signal, it is possible to measure not only RSSI but also CINR.

  This makes it possible to configure a radio base station that enables RSSI measurement of a plurality of groups.

  The first to eleventh embodiments can be appropriately combined within a range in which there is no contradiction in operation.

  The wireless communication system that performs autonomous cell adjustment according to the present invention as described above is useful in a cell configuration using a femto base station configured by a small cell, particularly on an outdoor street where a user moves. It is suitable for a radio communication system in which femto base stations such as cells and apartment houses are densely installed.

1 SON server
2 MME / GW
3 Base station (eNB)
4 Mobile station (UE)
5 Base station
6 Base station
7 SON Information Collection Department
8 SON group generator
9 MME / GW group controller
10 Base station transmission controller
11 Base station group controller
12 Mobile station transmission controller
13 Collected information
14 Collected information
15 Wireless transmission control signal
16 Notification from SON group generator to MME / GW
17 Notification between MME / GW group controller and base station group controller
18 Communication between base station group controllers
19 MME / GW Information Collection Department
20 Base Station Information Collection Department
21 Notification between MME / GW group controller and base station group controller
22 Control channel area
23 Data channel area
24 Synchronization Signal
25 subframes
26 6 Base station independent transmission
27 2-group transmission
28 cell # 1
29 cell # 2
30 cell # 3
31 cell # 4
32 cell # 5
33 cell # 6
34 User flow
35 Handover occurs
36 Group cell # 1
37 Group cell # 2
38 Handover occurs
39 3 Independent transmission of base stations
40 3 Base stations cooperate to transmit the same signal
41 Base station # 1
42 Base station # 2
43 Base Station # 3
46 Wireless transmission performance
47 User flow line information
48 Handover information
49 Handover failure
50 RSSI-CINR distribution
51 High RSSI / High CINR
52 Moving groups
53-57 cells
58 User flow
59 Group cell # 1
60 Group cell # 2
61 Group cell # 1
62 Group cell # 2
63 Radio frame utilization rate
64 Maximum radio frame utilization
65 Base station load information
66 Radio frame utilization
67 Load information
68-79 cells
80 Group cell # 1
81 Group cell # 1
82 Group cell # 2
83 Power control
86 Group cell # 1
87 Transmit power
88 Cell boundary # 1
89 Transmit power
90 Transmit power
91 Cell boundary # 2
92 RAB management
93 Data transmission section
94 PDCP
95 RRC
96 RLC
97 Request for transmission from RRC to RLC
98 Request for transmission from PDCP to RLC
99 New RLC PDU transmission request
100 Retransmission RLC PDU transmission request
101 New RLC PDU transmission request
102 Request for retransmission RLC PDU transmission
103 MAC
104 HARQ
105 HARQ delivery confirmation notification
106 HARQ data reception notification
107 Upstream transmission request
108 RRC
109 PDCP
110 RLC
111 MAC
112 HARQ
113 RAB connection
114 RRC group controller
115 RAB connection
116 RRC synchronization information
117 base station
118 RRC
119 RRC group controller
120 PDCP
121 RLC
122 RRC to RLC transmission request
123 Request for transmission from PDCP to RLC
124 Request to send new RLC PDU
125 Retransmission RLC PDU transmission request
126 Request to send new RLC PDU
127 Retransmission RLC PDU transmission request
128 MAC
129 HARQ
130 HARQ delivery confirmation notification
131 HARQ data reception notification
132 MAC group controller
133 MAC group controller
134 CRLC_CONFIG_REQ message
135 Highly reliable data transmission unit
136 Highly reliable data
137 CRLC_CONFIG_REQ message
138 Highly reliable data
139 CMAC_CONFIG_REQ message
140 CMAC_CONFIG_REQ message
141 MME / GW
142 Group Cell Base Station Transmission Control Equipment
143 High reliability data transmission unit
144 RRC
145 PDCP
146 RLC
147 MAC
148 base station
149 base station
150 Group cell base station transmission controller
151 Group cell MAC processor
152 HARQ (UM)
153 Wireless cardiac processing unit
154 Notification from group cell MAC processor to MAP generator
155 Cell base station transmission controller
156 PDCP
157 RRC
158 RLC
159 MAC
160 HARQ (AM)
161 MAP generation
162 Group cell base station transmission controller
163 Group cell MAC processor
164 HARQ section (UM)
165 Wireless signal processor
166 Notification from group cell MAC processor to MAP generator
167 Cell base station transmission controller
168 DCP
169 RRC
170 RLC
171 MAC
172 MAP generation
173 HARQ (AM)
174 CGroup_MAC_Config_Req message
175 CGroup_MAC_Config_Req message
176 PDCCH area used in group cells
177 PDCCH area available in a single cell
178 Subframe # 0
179 Subframe # 5
180 Subframe # 9
181 sync channel
182 Broadcast information (PBCH)
183 sync channel
184 Group cell # 1 subframe section
185 Group cell # 2 subframe section
186 Subframe # 0
187 Subframe # 5
188 Subframe # 9
189 Synchronization channel for group cell # 1
190 Broadcast information for group cell # 1 (PBCH)
191 Synchronization channel for group cell # 2
192 Broadcast information for group cell # 2 (PBCH)
193 Group composition index 0
194 Group composition index 1
195 Group composition index 2
196 Group composition index 3
197 Group composition index 4
198 Group composition index 5
199 Group composition index 6
200 group cell # 1 PDCCH (cell ID # 1)
201 Group cell # 2PDCCH (cell ID # 2)
202 Group cell # 1 area (cell ID # 1)
203 Group cell # 2 area (cell ID # 2)
204 Group cell # 1 PDCCH (cell ID # 1)
205 Group cell # 2 PDCCH information element
206 Group cell # 1 area (cell ID # 1)
207 Group cell # 2 area (cell ID # 2)
208 Subframe # 0
209 Subframe # 5
210 Subframe # 9
211 Sync channel
212 Broadcast information (PBCH)
213 sync channel
214 Sounding signal.

Claims (28)

A plurality of base stations that communicate with a mobile station, a network transmission control device that manages movement of the mobile station and performs data transmission to the base station, and an autonomous base station grouping control device that groups the base stations. In a mobile radio communication system including:
The autonomous base station group controller is
A grouping information collection unit for collecting grouping information for grouping base stations;
A group generation unit that generates one or a plurality of base station groups composed of a plurality of base stations based on the collected grouping information,
A base station included in one base station group synchronizes a transmission control signal instructing radio frame mapping with respect to one mobile station existing within the coverage area of the one base station group. The mobile radio communication system characterized by transmitting. The group generation unit
Generating a first base station group and a second base station group including a base station having a coverage area overlapping with a coverage area of a base station included in the first base station group;
The mobile station indicates handover information indicating a handover failure from the first base station group to the second base station group, a cell in which the handover has failed, the first base station group in the vicinity thereof, and the second base The mobile station radio communication according to claim 1, wherein base stations included in the first and second base station groups are changed based on reception power information and interference information of neighboring cells included in the station group. system. The group generation unit
When the radio frame utilization rate of the first base station group is monitored and the radio frame utilization rate of the first base station is increased, a base station having a high radio frame utilization rate from the base stations included in the first base station group The mobile station radio communication system according to claim 1, wherein the mobile station radio communication system is separated from the base station group as a second base station group. The group generation unit
When base stations included in the first base station group are simultaneously operating as a single base station, if the load state of the single base station changes, the transmission power of the base station is changed to Change the coverage area of a single base station according to the load status of a single base station, with little change in the coverage area of the station group,
The mobile station radio communication system according to claim 1. The network transmission control device and the base station according to claim 1 are:
In order to transmit the same control signal in synchronization with a transmission control signal instructing radio frame mapping to one mobile station existing in the coverage area of the one base station group,
The network transmission control device establishes a network management connection for managing a connection between the base station and the mobile station and a base station included in the base station group, and connects the base station and the mobile station through the management connection. 2. The connection management information of the base station group is notified to a base station included in the base station group with an execution time specified, and the base station executes this at a specified time. Network transmission control device. The base station according to claim 5 is:
In order to transmit the same control signal in synchronization with a transmission control signal instructing radio frame mapping to one mobile station existing in the coverage area of the one base station group, the base station The received connection control information between the base station and the mobile station is transmitted with an execution time to the base stations included in the base station group,
The base station included in the base station group that has received the connection information including the execution time executes the connection control information at a specified time, and connects to the network transmission control device according to claim 5. Base station equipment. The network control device and the base station according to claim 5,
The base station group is configured to transmit the same control signal in synchronization with a transmission control signal instructing radio frame mapping to one mobile station existing in the coverage area of the one base station group. The base station uses a one-way communication method in which the data burst size is fixed and retransmission control is not used, and the network control device further includes highly reliable data transmission in which a frame execution time is designated to the base station. The network control apparatus and base station apparatus according to claim 5. The base station according to claim 5 is:
In order to transmit the same control signal in synchronization with a transmission control signal instructing radio frame mapping to one mobile station existing in the coverage area of the one base station group, the base station The received uplink radio link bandwidth request from the mobile station is transmitted to a base station included in the base station group with an execution time, and the base station included in the base station group transmits the uplink link at a designated time. 6. The base station apparatus according to claim 5, wherein a bandwidth request is executed. A plurality of base stations that communicate with the mobile station, a network transmission control device that manages the movement of the mobile station and transmits data to the base station, an autonomous base station grouping control device that groups the base stations, and a base In a mobile radio communication system including a group base station transmission control device that performs transmission control of base stations included in a station group,
The group base station transmission control device is:
The base station that constitutes the group transmits the same transmission signal in synchronization with the transmission control signal that supports the mapping of the radio frame, so that the connection management process between the base station and the mobile station, and the radio transmission for data burst transmission A group base station transmission control device that executes processing, creates a transmission control signal and user burst for a base station group, designates an execution time, and transmits to a base station included in the group. The group base station transmission control apparatus according to claim 9,
In order to avoid retransmission control required to synchronize in a short time with the base stations constituting the group base station,
In the group base station transmission control device, deploy a highly reliable data transmission unit, perform only the division and assembly of service data units that do not perform retransmission processing,
The group base station transmission control layer and the base station apparatus according to claim 9, wherein non-delivery confirmation type hybrid retransmission control (Hybrid ARQ) in which retransmission processing is not performed in a base station included in the base station group is used. The base station according to claim 9 is:
In order to transmit the same control signal in synchronization with a transmission control signal instructing radio frame mapping to one mobile station existing in the coverage area of the base station group,
Receive radio frames and data bursts of base station groups created in the base station transmission controller,
At the time specified by the base station transmission control device, the remaining area of the radio frame is calculated, and a different data burst is generated for each base station.
Generate a transmission control signal to map it to the radio frame,
The base station according to claim 9, wherein a control signal for mapping different data bursts for each base station is transmitted together with the control signal for the group base station notified from the base station transmission control device. Station equipment. The base station and group base station transmission control device according to claim 9,
In order to transmit the same control signal in synchronization with the transmission control signal instructing the mapping of the radio frame to one mobile station existing in the coverage area of the base station group of 9 above,
When the base station receives a bandwidth request for an uplink radio link from a mobile station included in a group base station composed of a plurality of base stations,
10. The base station and group cell base station transmission control apparatus according to claim 9, wherein the uplink band request is transmitted to a group cell base station transmission control apparatus, and a control signal for mapping an uplink data burst is generated. . The base station according to claim 5 and the base station according to claim 9 are:
In order to transmit radio subframes belonging to a plurality of base station groups by time division multiplexing,
By setting the synchronization signal using the cell identifier of each base station group and the broadcast information of each base station group in subframes constituting a radio frame,
The base station according to claim 5, wherein the mobile station acquires the group cell identifier of the base station group and the broadcast information of the group cell in synchronization with a base station group desired by the mobile station. Wireless subframe format. The radio subframe constituting the radio frame of the base station according to claim 13 is:
According to the required transmission capacity of each base station group, the group attribute for each radio subframe is used as a group configuration index, and notified by the broadcast information of each base station group,
14. The radio subframe group attribute designation method according to claim 13, wherein a subframe attribute is assigned according to a required transmission capacity for each base station group. The radio subframe used in the base station according to claim 5 and claim 9 is:
In order to transmit a transmission control signal instructing mapping of radio frames belonging to a plurality of base station groups to mobile stations existing in the coverage areas of the plurality of base station groups,
10. A transmission control signal applying a scrambling and a pseudo sequence constituting a radio physical frame based on a different cell identifier for each base station group is created. A transmission control signal generation method for instructing radio frame mapping. The transmission control signal according to claim 15 is:
Map data bursts belonging to different base station groups,
16. The data burst generation method according to claim 15, wherein a radio frame is configured by applying the same scrambling and pseudo sequence as the transmission control signal to the data burst. The radio subframe used in the base station according to claim 5 and claim 9 is:
In order to transmit a transmission control signal instructing mapping of radio frames belonging to a plurality of base station groups to mobile stations existing in the coverage areas of the plurality of base station groups,
Each base station has a transmission control signal applying a scrambling and pseudo sequence based on the same cell identifier,
9. The transmission control signal information element for mapping data bursts of different group base stations and the cell identifier of the group base station are set in the transmission control signal. The base station transmission control signal generation method described. The transmission control signal information element according to claim 17 is:
The data burst generation according to claim 17, comprising mapping information and a cell identifier of data burst related to the transmission control signal information element, and applying scrambling of the data burst and a pseudo sequence using the cell identifier. Method. The transmission control signal generation method according to claim 15 and 17,
In addition to the synchronization signal related to the first transmission control signal, the reception signal strength for transmission control signals for different base station groups and a sounding signal for measuring inter-cell interference are provided. Item 19. A radio frame format according to Item 18. In a mobile radio communication system including a plurality of base stations that communicate with a mobile station, and a base station grouping transmission control device that groups the base stations and performs data transmission to the base station,
The base station grouping transmission control device is:
A grouping information collection unit for collecting grouping information for grouping base stations;
A group generation unit for generating one or a plurality of base station groups composed of a plurality of base stations based on the collected grouping information;
With
A plurality of base stations included in one base station group synchronize the same transmission control signal for instructing radio frame mapping to one mobile station existing in the coverage area of the one base station group. A mobile radio communication system characterized by transmitting a control signal. The group generation unit includes a first base station group and a second base station including a second boundary base station having a coverage area overlapping with a coverage area of the first boundary base station included in the first base station group Base stations included in the first and second base station groups based on handover information indicating that the mobile station failed to perform handover from the first base station group to the second base station group. The mobile radio communication system according to claim 20, wherein the station is changed. The group generation unit further uses the wireless transmission performance information in at least one of the first boundary base station and the second boundary base station when the handover failure occurs to the first and second base station groups. The mobile radio communication system according to claim 21, wherein the included base station is changed. The mobile radio communication system according to claim 22, wherein the radio transmission performance information is received power information and interference information. The group generation unit observes the magnitude of the load related to the generated one base station group. If the magnitude of the load exceeds a predetermined value, a part of the base stations included in the one base station group is 21. The mobile radio communication system according to claim 20, wherein the mobile radio communication system is separated from the one base station group. The mobile radio communication system according to claim 24, wherein the group generation unit determines a base station to be separated based on the number of mobile stations accommodated by the base station. The group generation unit, when one base station included in the generated base station group is operating as a single base station that accommodates a mobile station that communicates only with the one base station, A notification of a load state value as a single base station of the one base station is received from the grouping information collection unit, and when the load state value exceeds a predetermined value, the transmission power of the one base station is reduced. 21. The mobile station radio communication system according to claim 20, wherein The base station grouped transmission control apparatus transmits the same control signal in synchronization with a transmission control signal instructing radio frame mapping to one mobile station existing in the coverage area of one base station group. Therefore, a network management connection for managing a connection between the base station and the mobile station is established with one base station included in the base station group, and the base station and the mobile station are connected through the network management connection. The connection management information between them is specified to the execution time and notified to other base stations included in the base station group, and the other base station executes the connection management information at the specified execution time. The mobile radio communication system according to claim 20. The base station grouping transmission control device has an autonomous base station grouping control device that groups base stations based on the grouping information, and a base station grouped by the autonomous base station grouping control device. 21. The mobile radio communication system according to claim 20, further comprising a network transmission control device that performs data transmission.

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