JP7002745B2 - Coordination method between terminals for power-saving communication system - Google Patents

Description

The present invention relates to a terminal-to-terminal cooperation method for a power-saving communication system for reducing the average power consumption of each terminal and increasing the continuous usable time by wireless terminal cooperation in a communication system composed of a small number of terminals. ..

In recent years, the power consumption of smart phones has increased remarkably with the increase in performance and communication speed of mobile terminals such as smartphones. However, the performance of existing batteries is already nearing its limit, and there is no effective way to increase the amount of power supply other than increasing the battery capacity, which increases the weight and volume. In fact, it is common for today's users to carry some kind of portable battery for replenishment to extend the operating time. Smartphones are roughly divided into a communication unit, an information processing unit, and a display unit, but the ratio of power used by the communication unit is large, and the operating time is extended by improvement compared to other parts (display, CPU, etc.). The effect of is great.

Conventionally, the reduction of power consumption in the communication unit has been performed independently for each device. On the other hand, following the previous invention (Japanese Patent Application No. 2016-99688), the present invention proposes a power-saving terminal cooperation system using a proxy terminal. However, in the above-mentioned invention, when there are a plurality of proxy terminals, appropriate accommodation of the slave unit is not discussed. Therefore, in the present invention, a method for appropriately accommodating a group of handset terminals is proposed, and the power efficiency of communication is improved.

Although it is a limited function as a prior art, a simple wireless communication system for coordinating and coordinating between terminals is disclosed in, for example, Patent Document 1 (Japanese Unexamined Patent Publication No. 2002-141857). This builds a wireless LAN environment by interposing a relay station between the base station and the mobile terminal, and has a lower output between the relay station and the mobile terminal than between the base station and the mobile terminal. Communication is performed at high frequencies, and in a wireless LAN environment, communication between a relay station and a mobile terminal is prioritized over communication between a base station and a mobile terminal. A rod-shaped audio input / output device called a voice stick is connected to this mobile terminal by a weak wireless line.

Further, in Patent Document 2 (Japanese Unexamined Patent Publication No. 2015-122712), wireless communication that reduces the number of lines of mobile phone wireless communication of hybrid wireless communication between mobile phone wireless communication and other wireless communication to reduce the line usage fee. The system is disclosed. This wireless communication system collects the communication performance of the first wireless communication and determines whether or not the first wireless communication is possible based on the communication performance, and is based on the communication device and the availability of the first wireless communication. The group of the communication devices that perform the first wireless communication and the communication devices that perform the second wireless communication in addition to the first wireless communication from the communication devices of the group are designated. , The allocation means, and so on.

Further, in the description of Patent Document 2, the allocation means is a wireless communication unit that performs wireless communication with a slave unit or a master unit, a display unit using a liquid crystal display having a touch panel function, and a control that controls the wireless communication unit and the display unit. It is equipped with a unit, and is realized by, for example, adding a wireless communication unit to a tablet terminal and operating application software. In the construction of this wireless communication system, (1) first, the wireless communication performance of the wireless communication unit of each communication device of the communication device group for which the wireless communication system is to be constructed is monitored in advance, and (2) this monitoring is performed. Based on the result, it is determined whether or not the wireless communication units of each communication device can communicate with each other, and (3) Based on the determination of whether or not the wireless communication is possible, the slave unit performs wireless communication with the master unit by the allocation means. And (4) designation of the slave unit that should be the master unit that performs mobile phone communication between the master unit and the mobile phone base station in addition to wireless communication between the master unit and the slave unit from this group. I do.

Patent Document 3 is a wireless LAN access point sharing system in which a line contractor who has a line contract with a communication carrier provides a wireless LAN (Local Area Network) router owned by the line contractor as a wireless LAN access point of the communication carrier. And the wireless LAN access point sharing method.
Patent Document 4 relates to a technique for offloading a communication performed by a mobile phone terminal through a mobile phone network through a wireless LAN.

FIG. 2 of Non-Patent Document 1 describes an example in which a local network using short-range communication is connected to a base station of a telephone line network using long-range communication.

Japanese Unexamined Patent Publication No. 2002-141857 Japanese Unexamined Patent Publication No. 2015-122712 JP-A-2015-228602 JP-A-2015-0230330

"Energy saving in multi-standard mobile terminals through short-range cooperation" EURASIP Journal on Wireless Communications and Networking, 2012 2012: 159. DOI: 10.1186 / 1687-1499-2012-159

In the present invention, in a plurality of mobile communication terminals connected to a base station belonging to one communication line by a communication line, grouping for terminal-to-terminal cooperation is performed to suppress total power consumption per bit. Propose a method and improve the power efficiency of communication.

First, regarding the power efficiency, for example, the power efficiency of LTE (Long Term Evolution), which is a typical example of the current high-speed WAN technology, will be described. FIG. 1 shows an actual measurement example of the relationship between (1) RSRP (Reference Signal Received Power) as a parameter and (2) throughput and (3) power consumption. As can be seen from this graph, a terminal having a good RSRP value shows low power consumption even on the high throughput side. Further, since the power consumption is not zero even when the throughput is zero, it can be seen that it is most desirable from the viewpoint of power efficiency (bit / J) with respect to the unit data amount to use up the feasible throughput to the limit height.
From this fact, when setting a plurality of proxies to accommodate a plurality of mobile terminals, we propose a terminal-to-terminal cooperation method that serves as a guideline for how to form a terminal group.

The terminal-to-terminal cooperation method for the power-saving communication system of the present invention is a terminal group consisting of a plurality of mobile communication terminals connected to a base station belonging to one communication line by a communication line, and each mobile communication terminal is described above. It is possible to perform long-range communication that can communicate with a base station and short-range communication that consumes less power than the long-range communication, and suppresses the total power consumption per bit of communication in the above terminal group. It is a method of cooperation between terminals to do
(B) Each mobile communication terminal of the above terminal group shares at least information including achievable maximum throughput, remaining battery level, and received signal power with the above terminal group via a communication line for short-range communication.
(B) The parameters for grouping used to realize the above-mentioned cooperation between terminals in a plurality of mobile communication terminals by grouping are determined by the base station or a predetermined mobile communication terminal.
(C) Perform the above data processing for grouping at the base station or a predetermined mobile communication terminal to determine the proxy for each group.
(D) The result of the above grouping is transmitted to the above-mentioned plurality of mobile communication terminals other than itself by using a predetermined communication line, and the result is transmitted to the above-mentioned plurality of mobile communication terminals.
(E) Each mobile communication terminal that receives the information sets each proxy of each group to long-range communication, and each mobile communication terminal other than that proxy sets short-range communication and sets the proxy of its own group. To communicate with the base station via,
It is characterized by that.

The above grouping is
(A) The allowable communication throughput that each proxy terminal can provide to the client terminal accommodated in the proxy terminal is calculated.
(B) Each proxy terminal is a terminal having a communication demand relatively close to the allowable communication throughput when the allowable communication throughput does not fall below a predetermined value in the processing of each proxy terminal, and is not accommodated as a client terminal. If there is, the process of preferentially accommodating the terminal as the client terminal of the proxy terminal and reducing the communication demand from the allowable communication throughput is repeated.
(C) When there is no unaccommodated terminal or the allowable communication throughput is equal to or less than a predetermined value, each proxy terminal is grouped by each proxy terminal and the terminal accommodated as a client terminal of the proxy terminal. Form,
It is characterized by including the procedure.

In addition, the above grouping is
(1) Each proxy terminal allocates the above achievable maximum throughput as its own allowable communication throughput.
(2) In the process of repeating each proxy terminal in the order of each proxy terminal.
If the allowable communication throughput is less than the specified value, move to (4) and move to (4).
If the permissible communication throughput is not less than or equal to a predetermined value, the proxy terminal has a communication demand closest to its own permissible communication throughput, and if there is an unaccommodated terminal as a client terminal, that terminal is given priority. If there is no unaccommodated terminal in (3) after accommodating it as a client terminal of the proxy terminal, move to (4).
(3) Each proxy terminal obtains the difference between its maximum throughput and the communication demand of the accommodated client terminal, and shifts to (2) as a new allowable communication throughput.
(4) For each proxy terminal, a group is formed by each proxy terminal and a terminal accommodated as a client terminal of the proxy terminal.
It is characterized by including the procedure.

In addition, the above grouping is
(1) Each mobile communication terminal calculates the allowable communication throughput by finding the difference between its maximum communication throughput and communication demand.
(2) Proxy candidates are selected in order from the mobile communication terminal with the largest allowable communication throughput.
(3) The client candidates attached to the proxy candidates are set in order from the mobile communication terminal having the smallest allowable communication throughput.
(4) The selected proxy candidate surely meets both the communication demand of the client candidate and its own communication demand, and each of them is compared with the sum of the total power consumption per bit in the direct communication with the base station. If the total power consumption per bit in the above configuration by the proxy candidate and the client candidate is small, proceed to (5), otherwise proceed to (6).
(5) Set it as a formal proxy terminal and client terminal, and proceed to (7).
(6) Exclude from the client candidate terminal list, proceed to (7), and proceed to (7).
(7) If the confirmation of all terminals is completed, it will be a general end, but it will return to (2) above and restart, and if it is not completed, it will return to (3) above.
The above mobile communication terminals are classified into multiple groups by performing the following procedures in order.
In the plurality of at least one group, at least one mobile communication terminal is associated with the mobile communication terminal acting as a proxy.
It is characterized by that.

There are a plurality of the base stations, and each of the plurality of mobile communication terminals is characterized in that it is performed when it is related to any one of the base stations.

According to the present invention, even a terminal having a bad radio wave environment (such as not being able to see from a base station) or a terminal having a low battery level can realize communication with good power efficiency (bit / J) by passing through a nearby proxy terminal. Can be done. On the other hand, the terminal selected as the proxy terminal can improve the power efficiency of communication because the neighboring terminal communicates via itself. It is possible to reduce the number of terminals directly connected to the base station, effectively use radio resources, and reduce capital investment costs.

It is a figure which shows the actual measurement example of the relationship of 3 variables of (1) RSRP (Reference Signal Received Power) as a parameter, (2) throughput, and (3) power consumption about an LTE type mobile terminal. It is a figure which shows the configuration example for applying this invention. The rest of the mobile communication terminals are indirectly connected to the base station by a communication line. In the figure which shows the flowchart of grouping, (a) shows the flowchart for grouping, and (b) shows the timing chart. It is a schematic diagram which illustrates an example of the algorithm of the group formation method. It is a flowchart of an algorithm focusing on the realization of the communication demand of each terminal. It is a figure which shows the specific algorithm about the flowchart of FIG. It is a flowchart which shows the method of determining the client terminal to accommodate for each proxy terminal. It is a flowchart which shows the method of deciding the client terminal which accommodates one in order for each proxy terminal.

FIG. 2 shows a configuration example for applying the present invention. In FIG. 2A, a plurality of mobile communication terminals are directly connected to the base station via a communication line, and in FIG. 2B, some mobile communication terminals are directly connected to the base station, and the remaining mobile communication terminals are connected. It is indirectly connected to the base station via a communication line. In the present invention, the configuration of FIG. 2 (a) is roughly changed to the configuration of FIG. 2 (b), and a plurality of the mobile communication terminals are divided into a plurality of groups based on the connection status for coordinating between the terminals. Classify (grouping). In the present invention, it is assumed that at least one mobile communication terminal is engaged with the mobile communication terminal acting as a proxy in at least one group thereof, and all the mobile communication terminals are directly connected to the base station by a communication line. No configuration is assumed.
Further, although the number of base stations in the example of FIG. 2 is one, any one or a plurality of base stations may be used as long as they are connected to a common communication line.

FIG. 3A shows a flowchart for grouping as described above, and FIG. 3B shows a timing chart. Each terminal that intends to participate in the cooperation between terminals is a means of communication between terminals, such as various information for control, for example, the position information of each terminal, the maximum achievable throughput, the remaining battery level, the received signal power, and the like. Each information is shared by all of the above-mentioned plurality of mobile communication terminals via a Bluetooth (registered trademark) line, a Wi-Fi line, or the like.
Subsequently, the parameters necessary for grouping a plurality of mobile communication terminals are determined, and the grouping for determining the proxy of each group and the client of the proxy is performed by centralized control and distributed control according to a predetermined algorithm. Centralized control and distributed control here are centralized control that performs processing according to the above algorithm on one centralized control terminal and transmits and shares the result to other terminals, and centralized control that is shared on all the above mobile terminals. It is a distributed control that performs processing according to the above algorithm.

The proxy terminal and the client terminal in each group are determined by performing the grouping according to the above algorithm. Next, in each group, the proxy terminal broadcasts its information to each member of that group, and each client terminal that receives that information disconnects from the mobile phone network and bases through the proxy of the group to which it belongs. Communicate with the station.

In the above flowchart, the configuration of the algorithm for grouping the proxy and the client of the proxy is the most important for reducing the power consumption. We propose a group formation method and a handset terminal group accommodation method to solve this problem as follows.

First, FIG. 4 shows an example of the algorithm of the group formation method. Here, it is assumed that the received signal power, throughput, and communication demand (required communication speed) are known by prior measurement for each terminal.
(1) First, determine the proxy.
Which terminal is used as a proxy is determined as follows from the remaining battery level, received signal power, communication demand, etc. Proxy candidates at this stage are 1, 2, and 5.

The proxy terminal is selected according to the cooperation algorithm shown below. This is determined, for example, by evaluating the suitability of the items shown in Table 1 as a proxy terminal.

Here, each terminal is identified by a BT (Bluetooth®) MAC address, and the estimated operating time (or estimated operating time), throughput, average used band, and radio field strength between base station terminals for each terminal. , Bluetooth (registered trademark) Received Signal Strength Indicator (RSSI), mobile router applicability (described later), charge flag, etc. are evaluated by changing the weight for each item, and are suitable as a proxy terminal. Can be evaluated. This evaluation is performed, for example, as follows.

stomach. When the charge flag is OFF in all terminals, it means that all of the above terminals are battery-powered. For example, the evaluation value is calculated as follows.
Evaluation value = estimated operating time × (10) + throughput + average bandwidth used × (-10) + radio field intensity between base station terminals × (0.1) + mobile router applicability × (5).
The evaluation values in Table 1 are evaluation values according to this calculation formula, and the numbers marked with ◯ are in descending order.
B. When only one charging flag is ON, one is in use while charging, and the estimated operating time of the terminal is infinite. In this case, the same applies to the evaluation based on the above evaluation value, but the terminal in which the charge flag is ON becomes the proxy terminal.
C. When two or more charging flags are ON, the evaluation value is calculated in the terminal group, and the largest one is the proxy.

The fitness of the mobile router is an index indicating that the role as a proxy terminal is likely to be continued for a long time.

(2) Terminals that do not become proxies other than proxies need to either (2-1) perform individual communication using their own wireless WAN interface, or (2-2) connect to other proxies.
FIG. 4 shows a case where the maximum achievable throughput of each terminal is 10 Mbps and the communication demand of each terminal is different as a configuration example. Terminals with a communication demand of 10 Mbps do not become proxies but form a group independently (at this stage, proxy candidates are 2, 5). In the above determination, the proxy is a terminal whose communication demand is other than 10 Mbps, and the slave unit (proxy client) is a terminal whose communication demand is less than 10 Mbps.

Terminals (3, 4, 5) that are not selected as a proxy will be connected by selecting either proxy 2 or 5. Since the remaining allowable communication throughput of the proxy 2 is 2 Mbps, the terminal 4 closest to the terminal 4 is accommodated in the group to which the proxy 2 belongs. On the other hand, since the remaining allowable communication throughput of the proxy 5 is 9 Mbps, the terminals 3 and 6 are accommodated to form a new group. In this way, it is possible to improve the power efficiency of communication by using the achievable throughput and the communication demand so that each proxy is close to the maximum achievable throughput and constructing a group form in which communication resources are not wasted.

The algorithm for determining the proxy terminal and client terminal of each group needs to be changed according to the communication mode to be realized. For example, looking at the example shown in FIG. 4, the allowable communication throughput of all terminals is larger than their own communication demand, and even if all terminals communicate by wireless WAN, each terminal has a configuration that can satisfy the communication demand. I understand. Based on this configuration, the concept of grouping in FIG. 4 is to reduce the total power consumption of all terminals. For this reason, each group accommodates as many terminals as possible. However, on the other hand, in reality, the wireless WAN communication speed of some terminals may be lower than the communication demand depending on the radio wave environment or the like.
In such a case, for example, by reorganizing the group, the communication demand required via the proxy terminal can be satisfied. It is desirable that the algorithm for grouping is provided with such a group reorganization function.

Next, an example of a group formation algorithm aimed at realizing the communication demand of each terminal will be described.

FIG. 7 is a flowchart showing a grouping method for determining a client terminal to be accommodated for each proxy terminal.

The grouping includes the following procedures according to the reference numerals in FIG.
(A) The allowable communication throughput that each proxy terminal can provide to the client terminal accommodated in the proxy terminal is calculated.
(B-1): Each proxy terminal is a case where the allowable communication throughput exceeds a predetermined value in the processing of each proxy terminal.
(B-2): When there is a terminal that has a communication demand relatively close to the allowable communication throughput and is not accommodated as a client terminal.
(B-3): The terminal is preferentially accommodated as the client terminal of the proxy terminal, and the process of subtracting the communication demand from the allowable communication throughput is repeated by returning to (B-1).
(B-4): If the predetermined value is exceeded in (B-1) above, or if there is no uncollected terminal in (B-2) above, whether or not the processing for all proxy terminals is completed. Check, and if it is completed, proceed to the procedure of (C), and if it is not completed, specify the next proxy terminal in the order of arrangement and move to the above (B'-1).
(C): For each proxy terminal, a group is formed by each proxy terminal and a terminal accommodated as a client terminal of the proxy terminal.

FIG. 8 is a flowchart showing a grouping method in which each proxy terminal sequentially determines a client terminal to be accommodated one by one.

The grouping includes the following procedures according to the reference numerals in FIG.
(A') Each proxy terminal allocates the above achievable maximum throughput as its own allowable communication throughput.
(B'-1): In the process of repeating each proxy terminal in the order of each proxy terminal.
If the allowable communication throughput is less than or equal to the predetermined value, the process shifts to (C'), and the process shifts to (C').
(B'-2): When the allowable communication throughput is equal to or higher than a predetermined value, and the proxy terminal has a communication demand closest to its own allowable communication throughput and there is an unaccommodated terminal as a client terminal.
(B'-3): The terminal is preferentially accommodated as a client terminal of the proxy terminal, the communication demand is subtracted from the allowable communication throughput, and the following order is specified in the order of the proxy terminals, and the above (B'-3): Return to B'-1) and repeat the process.
(B'-4): If the predetermined value is not exceeded in the above (B'-1), or if there is no uncollected terminal in the above (B'-2), the processing for all proxy terminals is performed. Check if it is completed, and if it is completed, proceed to the procedure of (C'), and if it is not completed, specify the proxy terminal in the following order in the order of proxy terminals and specify the above (B'). -1) Move to.
(C'): For each proxy terminal, a group is formed by each proxy terminal and a terminal accommodated as a client terminal of the proxy terminal.

FIG. 5 shows a flowchart of the algorithm focusing on the realization of the communication demand of each terminal. Further, a more specific algorithm is shown in FIG.

(1) First, each terminal calculates the allowable communication throughput by finding the difference between its maximum communication throughput and the communication demand.
(2) Next, a terminal having a large allowable communication throughput (with a margin in the communication capacity of the wireless WAN) is selected as a proxy candidate.
(3) A terminal having a small allowable communication throughput (there is no margin in the communication capacity of the wireless WAN) is set as a client candidate terminal attached to the corresponding proxy candidate terminal. Simply put, a terminal that has a poor wireless WAN communication environment and is difficult to meet the communication demand first searches for a proxy terminal.
(4) Subsequently, the selected proxy candidate terminal surely meets both the client candidate terminal and its own communication demand, and the power consumption including short-range communication is surely smaller than the power consumed by each wireless WAN communication. If so, go to (5) below, otherwise go to (6) below.
(5) Set the official proxy terminal and client terminal, and go to (7).
(6) Exclude from the client candidate terminal list and go to (7).
(7) When the confirmation of all terminals is completed, go to (2) above. If it is not completed, go to (3) above.

By the above algorithm, grouping is performed based on the goal that terminals that cannot satisfy the communication demand by wireless WAN communication due to poor communication environment first search for a proxy terminal having a large allowable communication throughput.

In FIG. 6, U is a set of users, Ngroup is the number of groups, c0 and u are the demands of the user u, Pt and u are the output powers of the user u, and gn (n = 1 to Ngroup) is a structure including a proxy and a client. , Hu represents the uplink CSI (Channel State Information). At this time, each item of FIGS. 5 to 7 is the sixth, eighth, thirteenth, 14th to 16th, 17th to 19th, 22nd, and 34th items at the left end of FIG. 6, respectively. Corresponds to the item. Further, the loop returning from the 7th item to the 2nd item in FIG. 5 corresponds to the repetition of the 7th item to the 34th item in FIG. 6, and the loop returning from the 7th item to the 3rd item in FIG. Corresponds to the repetition of item 24.

The functions of the present invention can be implemented by existing smartphone functions (for example, wireless WAN, Wi-Fi, Bluetooth (registered trademark)) and software, but since they are provided in most smartphones on the market, they are widely used. It's easy. In particular, effective examples of use include use in evacuation shelters in the event of a disaster, and use in crowded situations on commuter trains in metropolitan areas even during normal times. On commuter trains, the arrangement of mobile terminals is dense, and the radio wave environment varies greatly depending on the standing position. That is, the radio wave propagation characteristics are significantly different between a smartphone near the window facing the base station and a smartphone whose surroundings are covered with people. In addition, a large number of passengers of the train enter and leave the cell covered by one base station all at once, which causes access concentration to the base station, and there is a problem in terms of radio wave utilization efficiency. However, in the present invention, some smartphones having good radio wave propagation characteristics can form a wireless local area network (LAN) by connecting to the base station and providing a proxy function. By bundling communication with the base station into a small number of proxies in this way, the total power required for connection with the base station can be saved. In addition, users other than the proxy will communicate with the proxy for each group, and the communication distance will be dramatically shortened (several kilometers → several meters) compared to communication with the base station, and power saving will be possible accordingly. ..

Claims (4)

In a terminal group consisting of a plurality of mobile communication terminals connected to a base station belonging to one communication line by the communication line, each mobile communication terminal has a long range communication capable of communicating with the base station and its length. It is possible to perform short-range communication, which consumes less power than range communication, and is a terminal-to-terminal cooperation method for suppressing the total power consumption per bit of communication in the above terminal group.
(B) Each mobile communication terminal of the terminal group provides control information including at least the maximum achievable throughput, battery remaining amount, and received signal power via the communication line for short-range communication. Share with
(B) The above-mentioned parameters for grouping (appropriate evaluation value as a proxy terminal obtained by a predetermined calculation formula using the above-mentioned control information) used for realizing the cooperation between the above-mentioned terminals in a plurality of the above - mentioned mobile communication terminals by grouping. Determined by the base station or the above-mentioned mobile communication terminal specified above ,
(C) The evaluation of the terminal group based on the grouping parameters is performed by the base station or the predetermined mobile communication terminal to determine the proxy terminal of each group, and the client terminal is accommodated in any of the groups. The above grouping is performed by the base station or the predetermined mobile communication terminal.
(D) The base station or the predetermined mobile communication terminal to which the grouping is performed transmits the result of the grouping to a plurality of the mobile communication terminals using the predetermined communication line.
(E) Each mobile communication terminal that has received the result of the grouping is set to the above- mentioned long-range communication in each proxy terminal of each group, and is set to the above- mentioned short -range communication in each mobile communication terminal other than the proxy terminal . Communicate with the base station via the proxy terminal of the group to which the
And
The above grouping is
(A) The allowable communication throughput that each proxy terminal can provide to the client terminal accommodated in the proxy terminal is calculated.
(B) Each proxy terminal is not accommodated as the client terminal in the mobile communication terminal having a communication demand relatively close to the allowable communication throughput when the allowable communication throughput exceeds a predetermined value in the processing for each proxy terminal. If there is the mobile communication terminal, the mobile communication terminal is preferentially accommodated as the client terminal of the proxy terminal, and the process of subtracting the communication demand from the allowable communication throughput is repeated.
(C) When there is no unaccommodated mobile communication terminal or when the allowable communication throughput becomes a predetermined value or less, each proxy terminal is accommodated as each proxy terminal and the client terminal of the proxy terminal. Form a group with the above mobile communication terminals,
A terminal-to-terminal coordination method for a power-saving communication system, which comprises the procedure of In a terminal group consisting of a plurality of mobile communication terminals connected to a base station belonging to one communication line by the communication line, each mobile communication terminal has a long range communication capable of communicating with the base station and its length. It is possible to perform short-range communication, which consumes less power than range communication, and is a terminal-to-terminal cooperation method for suppressing the total power consumption per bit of communication in the above terminal group.
(B) Each mobile communication terminal of the terminal group provides control information including at least the maximum achievable throughput, the remaining battery level, and the received signal power via the communication line for the short range communication. Share with
(B) The above-mentioned parameters for grouping (appropriate evaluation value as a proxy terminal obtained by a predetermined calculation formula using the above-mentioned control information) used for realizing the cooperation between the above-mentioned terminals in a plurality of the above-mentioned mobile communication terminals by grouping. Determined by the base station or the above-mentioned mobile communication terminal specified above,
(C) The evaluation of the terminal group based on the grouping parameters is performed by the base station or the predetermined mobile communication terminal to determine the proxy terminal of each group, and the client terminal is accommodated in any of the groups. The above grouping is performed by the base station or the predetermined mobile communication terminal.
(D) The base station or the predetermined mobile communication terminal to which the grouping is performed transmits the result of the grouping to a plurality of the mobile communication terminals using the predetermined communication line.
(E) Each mobile communication terminal that has received the result of the grouping is set to the above-mentioned long-range communication in each proxy terminal of each group, and is set to the above-mentioned short-range communication in each mobile communication terminal other than the proxy terminal. Communicate with the base station via the proxy terminal of the group to which the
And
The above grouping is
(1) Each proxy terminal allocates the above achievable maximum throughput as its own allowable communication throughput.
(2) In the process of repeating each proxy terminal in the order of each proxy terminal.
If the allowable communication throughput is less than the specified value, move to (4) and move to (4).
When the allowable communication throughput is not equal to or less than a predetermined value, and the proxy terminal has the mobile communication terminal having the communication demand closest to its own allowable communication throughput and the mobile communication terminal is not accommodated as the client terminal. , The mobile communication terminal is preferentially accommodated as the client terminal of the proxy terminal, and if there is no unaccommodated mobile communication terminal, the process proceeds to (4).
(3) Each proxy terminal obtains the difference between the maximum throughput of its own and the communication demand of the client terminal accommodated, and newly shifts to (2) as the allowable communication throughput.
(4) For each proxy terminal, a group is formed by each proxy terminal and the mobile communication terminal accommodated as the client terminal of the proxy terminal.
A terminal-to-terminal coordination method for a power-saving communication system, which comprises the procedure of In a terminal group consisting of a plurality of mobile communication terminals connected to a base station belonging to one communication line by the communication line, each mobile communication terminal has a long range communication capable of communicating with the base station and its length. It is possible to perform short-range communication, which consumes less power than range communication, and is a terminal-to-terminal cooperation method for suppressing the total power consumption per bit of communication in the above terminal group.
(B) Each mobile communication terminal of the terminal group shares at least the maximum achievable throughput with the terminal group via the communication line for the short range communication.
(B) The proxy terminal of each group is determined, and the grouping for categorizing the client terminal into one of the groups is performed by the base station or the predetermined mobile communication terminal.
(C) The grouped base station or the predetermined mobile communication terminal transmits the result of the grouping to a plurality of the mobile communication terminals using the predetermined communication line.
(D) Each mobile communication terminal that has received the result of the grouping is set to the above-mentioned long-range communication in each proxy terminal of each group, and is set to the above-mentioned short-range communication in each mobile communication terminal other than the proxy terminal. Communicate with the base station via the proxy terminal of the group to which the
And
The above grouping is
(1) Each mobile communication terminal calculates the allowable communication throughput by finding the difference between its maximum throughput and communication demand.
(2) Proxy candidates are selected in order from the mobile communication terminal having the largest allowable communication throughput.
(3) The client candidates attached to the proxy candidates are selected in order from the mobile communication terminal having the smallest allowable communication throughput.
(4) The selected proxy candidate surely satisfies both the communication demand of the client candidate and the communication demand of itself, and each of them is the sum of the total power consumption per bit in the direct communication with the base station. If the total power consumption per bit in the above configuration by the proxy candidate and the client candidate is smaller than that of the above, proceed to (5), otherwise proceed to (6).
(5) Set the official proxy terminal and client terminal, and proceed to (7).
(6) Exclude from the client candidate terminal list, proceed to (7), and proceed to (7).
(7) If the confirmation of all mobile communication terminals is completed, it returns to (2) above, and if it is not completed, it returns to (3) above.
The above mobile communication terminals are classified into multiple groups by performing the following procedures in order.
In at least one group among the plurality of classified groups, at least one mobile communication terminal is associated with the mobile communication terminal serving as the proxy terminal.
A terminal-to-terminal coordination method for a power-saving communication system characterized by being a thing . One of claims 1 to 3, wherein there are a plurality of the base stations, and each of the plurality of mobile communication terminals is related to any one of the base stations. One is a method for coordinating terminals for a power-saving communication system .

Images