WO2016180490A1 - Transmit power control - Google Patents
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- WO2016180490A1 WO2016180490A1 PCT/EP2015/060602 EP2015060602W WO2016180490A1 WO 2016180490 A1 WO2016180490 A1 WO 2016180490A1 EP 2015060602 W EP2015060602 W EP 2015060602W WO 2016180490 A1 WO2016180490 A1 WO 2016180490A1
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- cell
- transmission power
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- wireless communication
- downlink transmission
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/06—TPC algorithms
- H04W52/14—Separate analysis of uplink or downlink
- H04W52/143—Downlink power control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W52/245—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account received signal strength
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/30—TPC using constraints in the total amount of available transmission power
- H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
- H04W52/367—Power values between minimum and maximum limits, e.g. dynamic range
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Abstract
Downlink transmission power is controlled in a cell. Information about quality of signals received by wireless communication devices that are connected in the cell is used to calculate a maximum downlink transmission power that can provide a predetermined signal quality for the connected wireless communication devices. In a scenario where all connected wireless communication devices are located relatively close to a downlink transmitter, this maximum downlink transmission power can be kept at a relatively low level, compared to a scenario where wireless communication devices are located relatively far from the downlink transmitter. A maximum spatial extension of the cell is nevertheless maintained by controlling transmission, at a default downlink transmission power level, only in order to, for example, provide system information, synchronization signals and paging information.
Description
TRANSMIT POWER CONTROL
TECHNICAL FIELD
Embodiments herein relate to a network node in a wireless cellular network in which downlink transmission power is controlled. BACKGROUND
Wireless cellular networks, i.e. wireless communication systems that provide
communication services to wireless communication devices such as mobile phones, smartphones etc., have evolved during the last decade into systems that must utilize the radio spectrum in the most efficient manner possible. A reason for this is the ever increasing demand for high speed data communication capabilities in terms of, e.g., bitrate and to provide these capabilities at any given time and at any geographical location. In order to provide such services at any time and place, the wireless networks comprise a very large number of network nodes, such as radio base stations, that maintain both large and small radio cells. The larger cells typically cover large areas outdoor whereas the smallest cells cover much smaller areas, including such small indoor areas as single rooms in buildings. Needless to say, with such density of radio nodes the issue of energy use has become more relevant than before.
A widely used current wireless communication system is the third generation partnership project, 3GPP, long term evolution, LTE, system and in the LTE radio network, the radio frequency, RF, transmission power of a base station is always kept constant (at a predetermined maximum power level) in order to secure coverage of the cell or cells that the radio base station is in control of. Generally the power consumption from RF transmission is dominant part of the total power consumption of a radio base station, typically 50-80% of the total radio base station power consumption. Consequently, optimizing base station transmission power can significantly improve base station energy efficiency.
The geographical distribution of wireless communication devices in an LTE cell can be different from time to time. At some points in time the cell comprises many wireless communication devices spread out over the whole cell coverage area. But in case no wireless communication device is located at the edge of the cell, keeping the base station transmitting on the downlink at the constant maximum power leads to low energy efficiency, which is a drawback.
There are examples of prior art methods in the field of optimizing downlink transmission power usage. For example, international patent application published as WO2012/139251 describes power allocation in a radio base station in an LTE system. However, in
WO2012/139251 reports from a wireless communication device is used for allocating transmission power for each subcarrier (i.e. each Resource Element) and calculating a combination factor to determine downlink transmission power for a wireless
communication device. However, in practice, the LTE radio transmission power is carrier dependent. One carrier can be shared by several wireless communication devices.
Needless to say, this is a very complicated approach as it is not easy to allocate a specific transmission power for each and every wireless communication device in a cell.
SUMMARY
In view of the above, an object of the present disclosure is to overcome or at least mitigate at least some of the drawbacks related to prior art power control in a network node. This is achieved in one aspect by a method in a network node in a wireless cellular network. The method is for controlling downlink transmission power in a cell and it comprises controlling transmission, at a predetermined default downlink transmission power level, of downlink information for maintaining a maximum spatial extension of the cell. From a plurality of wireless communication devices that are connected to the network in the cell, respective information about received signal quality is received. Based on the respective received signal quality, calculation is made of a respective downlink transmission power level that can provide a respective predetermined received signal quality when received in the respective wireless communication device that is connected to the network in the cell. A determination is made, among the calculated downlink transmission power levels, of a maximum downlink transmission power level. Control of transmission, at the determined maximum downlink transmission power level, of downlink information for maintaining connections with the plurality of wireless communication devices that are connected to the network in the cell is then performed.
In other words, energy efficiency is improved in a cell in a wireless cellular network. A network node that is able to control downlink transmission power in the cell receives information about quality of signals received by wireless communication devices that are connected in the cell. This signal quality information is used to calculate a maximum downlink transmission power that can provide a predetermined signal quality for the
connected wireless communication devices. In a scenario where all connected wireless communication devices are located relatively close to the downlink transmitter, this maximum downlink transmission power can be kept at a relatively low level, compared to a scenario where wireless communication devices are located relatively far from the downlink transmitter. A maximum spatial extension of the cell is nevertheless maintained by controlling transmission, at a default downlink transmission power level, only in order to, for example, provide system information, synchronization signals and paging information.
In some embodiments, where downlink transmission is scheduled in radio sub-frames, the downlink information for maintaining a maximum spatial extension of the cell may be comprised in a first subset of the radio sub-frames, and the downlink information for maintaining connections with the plurality of wireless communication devices that are connected to the network in the cell may be comprised in a second subset of the radio sub-frames. In some embodiments, the downlink information for maintaining a maximum spatial extension of the cell may comprises any of synchronization signals, system information associated with the wireless cellular network, and paging information.
In some embodiments, where the wireless cellular network operates according to a 3GPP LTE specification, the reception of respective information about received signal quality from a plurality of wireless communication devices may comprises receiving a respective reference signal receive quality, RSRQ, report from the wireless communication devices that are connected to the network in the cell.
In these embodiments, the respective predetermined received signal quality may be a respective predetermined RSRQ based on a quality requirement associated with the respective wireless communication device. Moreover, the respective downlink
transmission power level may then be calculated by subtracting, from the default downlink transmission power level, a difference between the respective received RSRQ and the respective predetermined RSRQ.
In some embodiments, where the wireless cellular network operates according to a 3GPP LTE specification, the synchronization signals may be any of a primary synchronization signals, PSS, and a secondary synchronization signals, SSS.
In some embodiments, where the wireless cellular network operates according to a 3GPP LTE specification, the system information associated with the wireless cellular network may comprise any of a master information block, MIB, and a system information block, SIB. In some embodiments, where the wireless cellular network operates according to a 3GPP LTE specification, the paging information may be comprised in L1/L2 control signalling and in a paging channel, PCH.
In another aspect there is provided a network node for use in a wireless cellular network for controlling downlink transmission power in a cell. The network node comprises radio frequency control circuitry, a processor and a memory. The memory contains instructions executable by said processor whereby the network node is operative to:
- control transmission, at a predetermined default downlink transmission power level, of downlink information for maintaining a maximum spatial extension of the cell,
- receive, from a plurality of wireless communication devices that are connected to the network in the cell, respective information about received signal quality,
- calculate, based on the respective received signal quality, a respective downlink transmission power level that can provide a respective predetermined received signal quality when received in the respective wireless communication device that is connected to the network in the cell,
- determine, among the calculated downlink transmission power levels, a maximum downlink transmission power level, and
- control transmission, at the determined maximum downlink transmission power level, of downlink information for maintaining connections with the plurality of wireless communication devices that are connected to the network in the cell. In another aspect there is provided a computer program comprising instructions which, when executed on at least one processor in a network node, cause the network node to carry out the method according to the aspect summarized above.
In another aspect there is provided a carrier comprising a computer program according to the summarized aspect above, wherein the carrier is one of an electronic signal, an optical signal, a radio signal and a computer readable storage medium.
These other aspects provide the same effects and advantages as the method aspect summarized above.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 schematically illustrates a wireless cellular network,
figure 2 is a flowchart of a method,
figures 3a-d schematically illustrate content of radio frames,
figure 4 schematically illustrates a block diagram of a node, and
figure 5 schematically illustrates a block diagram of a node.
DETAILED DESCRIPTION
Figure 1 shows a number of entities in a wireless cellular network 100. A network node 102 in the form of a radio base station operates to maintain a radio cell 104 that has a maximum spatial extension 106. First, second and third wireless communication devices 1 10, 1 12, 1 14 operate in a connected mode in relation to the cell 104 and fourth and fifth wireless communication devices 1 16,1 18 operate in a mode that is not connected in relation to the cell 104, e.g. in an idle mode or in a mode that is in preparation for a handover to the cell 104. As the skilled person will realize, the network 100 may comprise a plurality of other nodes, as indicated by a network node 152, and many more wireless communication devices. However, for the purpose of this disclosure such other entities have been omitted for the sake of clarity.
The wireless cellular network 100 may be any 3GPP wireless cellular network, such as a Universal Mobile Telecommunication System, UMTS, Wideband Code Division Multiple Access, WCDMA, network, a Global System for Mobile communication, GSM, or the like. The wireless communication system 100 may be an evolution of any one of the aforementioned systems or a combination thereof, including a Long Term Evolution, LTE, wireless network.
Moreover, as used herein, the term "wireless communication device" may refer to a user equipment, UE, a subscriber unit, mobile phone, a cellular phone, a Personal Digital Assistant, PDA, equipped with radio communication capabilities, a smartphone, a laptop or personal computer, PC, equipped with an internal or external mobile broadband modem, a tablet PC with radio communication capabilities, a portable electronic radio communication device or the like. Turning now to figure 2 and with continued reference to figure 1 , downlink transmission power control in the cell 104 will be described in terms of a number of actions performed
by a network node, such as the network node 102 illustrated in figure 1. The actions may also be performed by the network node 152 or in collaboration between network node 152 and network node 102. (That is, the network node 102 may be a radio unit which may receive/transmit radio signals and the network node 152 may be a digital unit that operates as a controller and controls the radio unit.) As illustrated in figure 2, the method performed by the network node 102 comprises actions as follows:
Action 201
The network node 102 controls transmission of downlink information for maintaining a maximum spatial extension 106 of the cell 104. This transmission is at a predetermined default downlink transmission power level.
The downlink transmission may be scheduled in radio sub-frames. In such embodiments the downlink information for maintaining a maximum spatial extension of the cell may comprised in a first subset of the radio sub-frames and the downlink information for maintaining connections with the plurality of wireless communication devices that are connected to the network in the cell may be comprised in a second subset of the radio sub-frames, as will be described in more detail below in connection with action 209.
Embodiments include those where the downlink information for maintaining a maximum spatial extension of the cell comprises any of synchronization signals, system information associated with the wireless cellular network and paging information. The wireless cellular network may operate according to a 3GPP LTE specification. The synchronization signals may in such embodiments be any of a primary synchronization signals, PSS, and a secondary synchronization signals, SSS. This is illustrated in figure 3a, where it is shown that PSS and SSS may be transmitted using a respective symbol within two sub-frames within a radio frame. It is to be noted that the expression "radio frame" is to be considered equivalent with the expression "frame" as used in figures 3a-d.
Furthermore, in 3GPP LTE embodiments, the system information associated with the wireless cellular network may comprise any of a master information block, MIB, and a system information block, SIB. This is illustrated in figure 3b, where it is shown that MIB may be transmitted in a physical broadcast channel, PBCH, using four symbols within a sub-frame within a radio frame. Figure 3c exemplifies transmission of SIB in a physical downlink shared channel, PDSCH, using various sub-frames that are repeated at, e.g., every 16th radio frame.
Furthermore, in 3GPP LTE embodiments, the paging information may be comprised in L1/L2 control signalling and in a paging channel, PCH. This is illustrated in figure 3d, where it is shown that such paging information may be transmitted in a sub-frame that is repeated at, e.g., every 32nd radio frame. Action 203
The network node 102 receives respective information about received signal quality from a plurality of wireless communication devices 1 10,1 12,1 14. These wireless
communication devices 1 10,1 12,1 14 are connected to the network 100 in the cell 104. For example, in 3GPP LTE embodiments these wireless communication devices 1 10,1 12,1 14 may be in the RRC_CONNECTED mode.
In some embodiments, the wireless cellular network 100 operates according to a 3GPP LTE specification. In such embodiments, the action 203 of receiving respective
information about received signal quality from the plurality of wireless communication devices 1 10,1 12,1 14 may comprise receiving a respective reference signal receive quality, RSRQ, report from the wireless communication devices 1 10,1 12,1 14 that are connected to the network 100 in the cell 104.
Action 205
The network node 102 calculates, based on the respective received signal quality, a respective downlink transmission power level that can provide a respective predetermined received signal quality when received in the respective wireless communication device 1 10,1 12,1 14 that is connected to the network 100 in the cell 104.
In the embodiments where the wireless cellular network 100 operates according to a 3GPP LTE specification and the information about received signal quality is comprised in an RSRQ report, the respective predetermined received signal quality may be a respective predetermined RSRQ based on a quality requirement associated with the respective wireless communication device 1 10,1 12,1 14. In such embodiments, the respective downlink transmission power level may be calculated in action 205 by subtracting, from the default downlink transmission power level, a difference between the respective received RSRQ and the respective predetermined RSRQ. Action 207
The network node 102 determines a maximum downlink transmission power level among the calculated downlink transmission power levels.
Action 209
The network node 102 controls transmission of downlink information for maintaining connections with the plurality of wireless communication devices that are connected to the network in the cell. This transmission is at the determined maximum downlink
transmission power level.
The downlink transmission power control as described above can also be exemplified in a 3GPP LTE embodiment as follows. References are made to the entities presented in figure 1 .
Let PTx 0 be the predetermined default radio transmission power of a base station, i.e. the network node 102, which is set to ensure the radio signal from the base station 102 can reach the cell edge, i.e. the maximum spatial extension 106 of the cell 104. All the wireless communication devices 1 10, 1 12, 1 14 that are connected to the cell 104 shall be detected, and these wireless communication devices 1 10, 1 12, 1 14 report their measured RSRQ to the base station 102. These reports will enable a creation of a measured RSRQ list (RSRQmeas.-i , RSRQ meas,2, RSRQ meas.N) in the base station 102, where N is the number of wireless communication devices connected in the cell. In the example in figure 1 , this number N is 3. For terminal i (i<N), based on the RF tuning process of the cell and quality-of-service, QoS, or other priority schedule setting, the base station 102 can assign a RSRQ value, RSRQassigj, for each connected wireless communication device, i.e. the respective predetermined received signal quality as defined above. The base station 102 compares the assigned RSRQ value with the corresponding measured RSRQ value, RSRQmeasj, and calculate the needed transmission power by:
Ptx,i = Ptx,o-(RSRQmeas,rRSRQasSjgj) [dBm]
A list of Ptx for all wireless communication devices in the cell 104 is then generated. This list contains (Ρτχ,-ι, Ρτχ,2,■■■ , Ρτχ, N)- The base station 102 then selects the maximum value from this list, i.e. performs a function Max(PTx,i , Ρτχ,2,■■■ , Ρτχ, N), and uses the selected maximum value as transmission power PTx.
To avoid compromising the cell coverage, the downlink information for maintaining a maximum spatial extension 106 of the cell 104, e.g. the synchronization, cell system information and paging sub-frames are transmitted at the predetermined default transmission power PTx,o- Therefore the base station 102 can detect if any wireless communication device enters the cell 104 and an idle wireless communication device in
the cell 104 can access the base station 102 as well as be paged by the base station 102, i.e. wireless communication devices 1 16, 1 18 illustrated close to the maximum spatial extension 106 of the cell 104 in figure 1. If such a wireless communication device 1 16, 1 18 is detected, the RSRQ list is updated by adding the RSRQ of a newly detected wireless communication device and updating the RSRQ value of a moving wireless communication device.
In order to illustrate an advantage of embodiments of the above exemplified power control, simulations have been made of a base station with one transmitter and one receiver, at 2100 MHz with a predetermined default 80W RF output power per power amplifier in the transmitter. The default RF transmission power at the antenna of the base station is then (assuming 3 dBm insertion loss at the antenna) Ptx,o = 46dBm. Assuming there are five wireless communication devices in the cell, and the assigned RSRQ values (RSRQassigj) and measured RSRQ values (RSRQmeas,i) for each wireless communication device are as listed in the following table:
From this list, the maximum downlink transmission power level is determined at 45 dBm. With the assumed insertion loss of 3 dBm, the required power from the power amplifier becomes 48 dBm, which is equivalent to 63 W. Then, assuming that the base station transmitter has a duty cycle of 50% to broadcast control information, i.e. sync information,
system information and paging (the remaining 50% power being used for downlink transmission), the power saving becomes:
80W - 63W
Turning now to figure 4, a network node 400 will be described in some detail. The network node 400 may for example correspond to any of the network nodes 102, 152 5 described above, and the network node 400 is for use in a wireless cellular network for controlling downlink transmission power in a cell. The network node 400 comprises radio frequency control circuitry 406, a processor 402 and a memory 404. The memory 404 contains instructions executable by the processor 402 whereby the network node 400 is operative to:
10 - control transmission, at a predetermined default downlink transmission power level, of downlink information for maintaining a maximum spatial extension of the cell,
- receive, from a plurality of wireless communication devices that are connected to the network in the cell, respective information about received signal quality,
- calculate, based on the respective received signal quality, a respective downlink 15 transmission power level that can provide a respective predetermined received signal quality when received in the respective wireless communication device that is connected to the network in the cell,
- determine, among the calculated downlink transmission power levels, a maximum downlink transmission power level, and
20 - control transmission, at the determined maximum downlink transmission power level, of downlink information for maintaining connections with the plurality of wireless communication devices that are connected to the network in the cell.
The instructions that are executable by the processor 402 may be software in the form of a computer program 441. The computer program 441 may be contained in or by a carrier 25 442, which may provide the computer program 441 to the memory 404 and processor 402. The carrier 442 may be in any suitable form including an electronic signal, an optical signal, a radio signal or a computer readable storage medium.
In some embodiments, the network node 400 is operative such that downlink transmission is scheduled in radio sub-frames and operative such that:
30 - the downlink information for maintaining a maximum spatial extension of the cell is comprised in a first subset of the radio sub-frames, and
- the downlink information for maintaining connections with the plurality of wireless communication devices that are connected to the network in the cell is comprised in a second subset of the radio sub-frames.
In some embodiments, the network node 400 is operative such that the downlink information for maintaining a maximum spatial extension of the cell comprises any of:
- synchronization signals,
- system information associated with the wireless cellular network, and
- paging information.
In some embodiments, where the wireless cellular network is configured to operate according to a 3GPP LTE, specification, the network node 400 is operative such that the reception of respective information about received signal quality from a plurality of wireless communication devices comprises:
- receiving a respective reference signal receive quality, RSRQ, report from the wireless communication devices that are connected to the network in the cell. In some embodiments, where the respective predetermined received signal quality is a respective predetermined RSRQ based on a quality requirement associated with the respective wireless communication device, the network node 400 is operative such that the respective downlink transmission power level is calculated by subtracting, from the default downlink transmission power level, a difference between the respective received RSRQ and the respective predetermined RSRQ.
In some embodiments, where the wireless cellular network is configured to operate according to a 3GPP LTE specification, the network node 400 is operative such that the synchronization signals are any of a primary synchronization signals, PSS, and a secondary synchronization signals, SSS. In some embodiments, where the wireless cellular network is configured to operate according to a 3GPP LTE specification, the network node 400 is operative such that the system information associated with the wireless cellular network comprises any of a master information block, MIB, and a system information block, SIB.
In some embodiments, where the wireless cellular network is configured to operate according to a 3GPP LTE specification, the network node is operative such that the paging information is comprised in L1/L2 control signalling and in a paging channel, PCH.
Turning now to figure 5, a network node 500 will be described in some detail. The network node 500 may for example correspond to any of the network nodes 102, 152 described above, and the network node 500 is for use in a wireless cellular network for controlling downlink transmission power in a cell. The network node 500 comprises:
- a controlling module 502 configured to control transmission, at a predetermined default downlink transmission power level, of downlink information for maintaining a maximum spatial extension of the cell,
- a receiving module 504 configured to receive, from a plurality of wireless communication devices that are connected to the network in the cell, respective information about received signal quality,
- a calculating module 506 configured to calculate, based on the respective received signal quality, a respective downlink transmission power level that can provide a respective predetermined received signal quality when received in the respective wireless communication device that is connected to the network in the cell,
- a determining module 508 configured to determine, among the calculated downlink transmission power levels, a maximum downlink transmission power level, and
- a controlling module 510 configured to control transmission, at the determined maximum downlink transmission power level, of downlink information for maintaining connections with the plurality of wireless communication devices that are connected to the network in the cell.
The network node 500 may comprise further modules that are configured to perform in a similar manner as, e.g., the network node 400 described above in connection with figure 4.
As used herein, the term "processing module" may refer to a processing circuit, a processing unit, a processor, an Application Specific integrated Circuit (ASIC), a Field- Programmable Gate Array (FPGA) or the like. As an example, a processor, an ASIC, an FPGA or the like may comprise one or more processor kernels. In some examples, the processing module may be embodied by a software module or hardware module. Any such module may be a determining means, estimating means, capturing means, associating means, comparing means, identification means, selecting means, receiving means, transmitting means or the like as disclosed herein. As an example, the expression "means" may be a module, such as a determining module, selecting module, etc.
As used herein, the expression "configured to" may mean that a processing circuit is configured to, or adapted to, by means of software configuration and/or hardware configuration, perform one or more of the actions described herein.
As used herein, the term "memory" may refer to a hard disk, a magnetic storage medium, a portable computer diskette or disc, flash memory, random access memory (RAM) or the like. Furthermore, the term "memory" may refer to an internal register memory of a processor or the like.
As used herein, the term "computer readable medium" may be a Universal Serial Bus (USB) memory, a DVD-disc, a Blu-ray disc, a software module that is received as a stream of data, a Flash memory, a hard drive, a memory card, such as a MemoryStick, a Multimedia Card (MMC), etc.
As used herein, the term "computer readable code units" may be text of a computer program, parts of or an entire binary file representing a computer program in a compiled format or anything there between. As used herein, the terms "number", "value" may be any kind of digit, such as binary, real, imaginary or rational number or the like. Moreover, "number", "value" may be one or more characters, such as a letter or a string of letters, "number", "value" may also be represented by a bit string.
As used herein, the expression "in some embodiments" has been used to indicate that the features of the embodiment described may be combined with any other embodiment disclosed herein.
Even though embodiments of the various aspects have been described, many different alterations, modifications and the like thereof will become apparent for those skilled in the art. The described embodiments are therefore not intended to limit the scope of the present disclosure.
Claims
1 . A method in a network node (102,500) in a wireless cellular network (100) for controlling downlink transmission power in a cell (104), the method comprising:
- controlling (201 ) transmission, at a predetermined default downlink transmission power level, of downlink information for maintaining a maximum spatial extension (106) of the cell,
- receiving (203), from a plurality of wireless communication devices (1 10,1 12,1 14) that are connected to the network in the cell, respective information about received signal quality,
- calculating (205), based on the respective received signal quality, a respective downlink transmission power level that can provide a respective predetermined received signal quality when received in the respective wireless communication device that is connected to the network in the cell,
- determining (207), among the calculated downlink transmission power levels, a maximum downlink transmission power level, and
- controlling (209) transmission, at the determined maximum downlink transmission power level, of downlink information for maintaining connections with the plurality of wireless communication devices that are connected to the network in the cell.
2. The method of claim 1 , wherein downlink transmission is scheduled in radio sub-frames and wherein:
- the downlink information for maintaining a maximum spatial extension of the cell is comprised in a first subset of the radio sub-frames, and
- the downlink information for maintaining connections with the plurality of wireless communication devices that are connected to the network in the cell is comprised in a second subset of the radio sub-frames.
3. The method of claim 2, wherein the downlink information for maintaining a maximum spatial extension of the cell comprises any of:
- synchronization signals,
- system information associated with the wireless cellular network, and
- paging information.
4. The method of any of claims 1 to 3, wherein the wireless cellular network operates according to a third generation partnership project, 3GPP, long term evolution, LTE, specification and wherein the reception of respective information about received signal quality from a plurality of wireless communication devices comprises:
- receiving a respective reference signal receive quality, RSRQ, report from the wireless communication devices that are connected to the network in the cell.
5. The method of claim 4, wherein the respective predetermined received signal quality is a respective predetermined RSRQ based on a quality requirement associated with the respective wireless communication device and wherein the respective downlink transmission power level is calculated by subtracting, from the default downlink transmission power level, a difference between the respective received RSRQ and the respective predetermined RSRQ.
6. The method of any of claims 3 to 5, wherein the wireless cellular network operates according to a third generation partnership project, 3GPP, long term evolution, LTE, specification and wherein the synchronization signals are any of a primary
synchronization signals, PSS, and a secondary synchronization signals, SSS.
7. The method of any of claims 3 to 6, wherein the wireless cellular network operates according to a third generation partnership project, 3GPP, long term evolution, LTE, specification and wherein the system information associated with the wireless cellular
network comprises any of a master information block, MIB, and a system information block, SIB.
8. The method of any of claims 3 to 7, wherein the wireless cellular network operates according to a third generation partnership project, 3GPP, long term evolution, LTE, specification and wherein the paging information is comprised in L1/L2 control signalling and in a paging channel, PCH.
9. A network node (102,400) for use in a wireless cellular network (100) for controlling downlink transmission power in a cell (104), the network node comprising radio frequency control circuitry (406), a processor (402) and a memory (404), said memory containing instructions executable by said processor whereby said network node is operative to:
- control transmission, at a predetermined default downlink transmission power level, of downlink information for maintaining a maximum spatial extension (106) of the cell,
- receive, from a plurality of wireless communication devices (1 10,1 12,1 14) that are connected to the network in the cell, respective information about received signal quality,
- calculate, based on the respective received signal quality, a respective downlink transmission power level that can provide a respective predetermined received signal quality when received in the respective wireless communication device that is connected to the network in the cell,
- determine, among the calculated downlink transmission power levels, a maximum downlink transmission power level, and
- control transmission, at the determined maximum downlink transmission power level, of downlink information for maintaining connections with the plurality of wireless communication devices that are connected to the network in the cell.
10. The network node of claim 9, operative such that downlink transmission is scheduled in radio sub-frames and operative such that:
- the downlink information for maintaining a maximum spatial extension of the cell is comprised in a first subset of the radio sub-frames, and
5 - the downlink information for maintaining connections with the plurality of wireless communication devices that are connected to the network in the cell is comprised in a second subset of the radio sub-frames.
1 1 . The network node of claim 10, operative such that the downlink information for maintaining a maximum spatial extension of the cell comprises any of:
10 - synchronization signals,
- system information associated with the wireless cellular network, and
- paging information.
12. The network node of any of claims 9 to 1 1 , where the wireless cellular network is configured to operate according to a third generation partnership project, 3GPP, long term
15 evolution, LTE, specification and where the network node is operative such that the
reception of respective information about received signal quality from a plurality of wireless communication devices comprises:
- receiving a respective reference signal receive quality, RSRQ, report from the wireless communication devices that are connected to the network in the cell.
20 13. The network node of claim 12, where the respective predetermined received signal quality is a respective predetermined RSRQ based on a quality requirement associated with the respective wireless communication device and where the network node is operative such that the respective downlink transmission power level is calculated by subtracting, from the default downlink transmission power level, a difference between the
25 respective received RSRQ and the respective predetermined RSRQ.
14. The network node of any of claims 9 to 13, where the wireless cellular network is configured to operate according to a third generation partnership project, 3GPP, long term evolution, LTE, specification and where the network node is operative such that the synchronization signals are any of a primary synchronization signals, PSS, and a
5 secondary synchronization signals, SSS.
15. The network node of any of claims 9 to 14, where the wireless cellular network is configured to operate according to a third generation partnership project, 3GPP, long term evolution, LTE, specification and where the network node is operative such that the system information associated with the wireless cellular network comprises any of a
10 master information block, MIB, and a system information block, SIB.
16. The network node of any of claims 9 to 15, where the wireless cellular network is configured to operate according to a third generation partnership project, 3GPP, long term evolution, LTE, specification and where the network node is operative such that the paging information is comprised in L1/L2 control signalling and in a paging channel, PCH.
15 17. A computer program (441 ), comprising instructions which, when executed on at least one processor (402) in a network node (102, 400), cause the network node to carry out the method according to any one of claims 1 to 8.
18. A carrier (442) comprising the computer program of claim 17, wherein the carrier is one of an electronic signal, an optical signal, a radio signal and a computer readable
20 storage medium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/EP2015/060602 WO2016180490A1 (en) | 2015-05-13 | 2015-05-13 | Transmit power control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/EP2015/060602 WO2016180490A1 (en) | 2015-05-13 | 2015-05-13 | Transmit power control |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2016180490A1 true WO2016180490A1 (en) | 2016-11-17 |
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ID=53269454
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2015/060602 WO2016180490A1 (en) | 2015-05-13 | 2015-05-13 | Transmit power control |
Country Status (1)
| Country | Link |
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| WO (1) | WO2016180490A1 (en) |
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| GB2472597A (en) * | 2009-08-11 | 2011-02-16 | Ubiquisys Ltd | Calculating downlink powers for transmissions from femtocell access points |
| WO2012139251A1 (en) | 2011-04-13 | 2012-10-18 | Telefonaktiebolaget L M Ericsson (Publ) | Method and base station for power allocation in wireless system |
| EP2549790A1 (en) * | 2010-03-17 | 2013-01-23 | Fujitsu Limited | Mobile communication system, base station, and cell coverage control method |
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| GB2311912A (en) * | 1996-04-04 | 1997-10-08 | At & T Wireless Services Inc | Method for determining organization parameters in a wireless communication system |
| GB2472597A (en) * | 2009-08-11 | 2011-02-16 | Ubiquisys Ltd | Calculating downlink powers for transmissions from femtocell access points |
| EP2549790A1 (en) * | 2010-03-17 | 2013-01-23 | Fujitsu Limited | Mobile communication system, base station, and cell coverage control method |
| WO2012139251A1 (en) | 2011-04-13 | 2012-10-18 | Telefonaktiebolaget L M Ericsson (Publ) | Method and base station for power allocation in wireless system |
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