WO2017119841A1 - Sélection d'une puissance de sortie de liaison descendante dans un réseau de communication sans fil - Google Patents

Sélection d'une puissance de sortie de liaison descendante dans un réseau de communication sans fil Download PDF

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Publication number
WO2017119841A1
WO2017119841A1 PCT/SE2017/050004 SE2017050004W WO2017119841A1 WO 2017119841 A1 WO2017119841 A1 WO 2017119841A1 SE 2017050004 W SE2017050004 W SE 2017050004W WO 2017119841 A1 WO2017119841 A1 WO 2017119841A1
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WO
WIPO (PCT)
Prior art keywords
output power
network node
wireless communication
communication network
gsm
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PCT/SE2017/050004
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English (en)
Inventor
Olof Liberg
John Walter Diachina
Ulf HÄNDEL
Birgitta SAGEBRAND
Mårten SUNDBERG
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Telefonaktiebolaget Lm Ericsson (Publ)
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Publication of WO2017119841A1 publication Critical patent/WO2017119841A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/08—Arrangements for detecting or preventing errors in the information received by repeating transmission, e.g. Verdan system
    • 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
    • H04W52/242—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account path loss
    • 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
    • H04W52/38—TPC being performed in particular situations
    • H04W52/50—TPC being performed in particular situations at the moment of starting communication in a multiple access environment
    • 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
    • H04W52/146—Uplink power control

Definitions

  • GSM Global System for Mobile communications
  • EC-GSM-loT Extended Coverage GSM Internet of Things
  • Wireless communication devices such as wireless communication devices, that simply may be named wireless devices, may also be known as e.g. User Equipments (UEs), mobile terminals, wireless terminals and/or Mobile Stations (MS).
  • UEs User Equipments
  • MS Mobile Stations
  • a wireless device is enabled to communicate wirelessly in a wireless communication network that typically is a cellular communications network, which may also be referred to as a wireless communication system, or radio communication system, sometimes also referred to as a cellular radio system, cellular network or cellular communication system.
  • a wireless communication network may sometimes simply be abbreviated NW.
  • the communication may be performed e.g.
  • Wireless devices may be so called Machine to Machine (M2M) devices or Machine Type of Communication (MTC) devices, i.e. a device that is not necessarily associated with a conventional user, such as a human, directly using the device.
  • M2M Machine to Machine
  • MTC Machine Type of Communication
  • the wireless device may be, for example, portable, pocket-storable, hand-held, computer-comprised, or vehicle-mounted mobile device, enabled to communicate voice and/or data, via the RAN, with another entity, such as another wireless device or a server.
  • the cellular communication network covers a geographical area which is divided into cell areas, wherein each cell area is served by at least one base station, or Base Station (BS), e.g. a Radio Base Station (RBS), which sometimes may be referred to as e.g. "eNB”, “eNodeB”, “NodeB”, “B node”, or BTS (Base Transceiver Station), depending on the technology and terminology used.
  • BS Base Station
  • RBS Radio Base Station
  • eNB Radio Base Station
  • eNodeB eNodeB
  • NodeB Node
  • BTS Base Transceiver Station
  • the base stations may be of different classes such as e.g. macro eNodeB, home eNodeB or pico base station, based on transmission power and thereby also cell size.
  • a cell is typically identified by one or more cell identities.
  • the base station at a base station site provides radio coverage for one or more cells.
  • a cell is thus associated with a geographical area where radio coverage for that cell is provided by the base station at the base station site. Cells may overlap so that several cells cover the same geographical area.
  • the base station providing or serving a cell is meant that the base station provides radio coverage such that one or more wireless devices located in the geographical area where the radio coverage is provided may be served by the base station in said cell.
  • a wireless device is said to be served in or by a cell this implies that the wireless device is served by the base station providing radio coverage for the cell.
  • One base station may serve one or several cells. Further, each base station may support one or several communication technologies. The base stations communicate over the air interface operating on radio frequencies with the wireless device within range of the base stations.
  • GSM Global System for Mobile Communication
  • base stations which may be referred to as eNodeBs or eNBs, may be directly connected to other base stations and may be directly connected to one or more core networks.
  • 3GPP 3rd Generation Partnership Project
  • eNodeBs Long Term Evolution
  • eNBs may be directly connected to other base stations and may be directly connected to one or more core networks.
  • UMTS is a third generation mobile communication system, which may be referred to as 3rd generation or 3G, and which evolved from the GSM, and provides improved mobile communication services based on Wideband Code Division Multiple Access (WCDMA) access technology.
  • WCDMA Wideband Code Division Multiple Access
  • UTRAN UMTS Terrestrial Radio Access Network
  • UTRAN is essentially a radio access network using wideband code division multiple access for wireless devices.
  • GSM General Packet Radio Service
  • EDGE Enhanced Data rates for GSM Evolution
  • GPRS Enhanced GPRS
  • IMT-SC IMT Single Carrier
  • Enhanced Data rates for Global Evolution is a digital mobile phone technology that allows improved data transmission rates as a backward-compatible extension of GSM.
  • High Speed Packet Access is an amalgamation of two mobile telephony protocols, High Speed Downlink Packet Access (HSDPA) and High Speed Uplink Packet Access (HSUPA), defined by the 3rd Generation Partnership Project (3GPP), that extends and improves the performance of existing 3rd generation mobile telecommunication networks utilizing the WCDMA.
  • WCDMA/HSPA 3rd Generation Partnership Project
  • 3GPP 3rd Generation Partnership Project
  • base stations which may be referred to as eNodeBs or eNBs, may be directly connected to other base stations and may be directly connected to one or more core networks.
  • the 3GPP has undertaken to evolve further the UTRAN and GSM based radio access network technologies, for example into evolved UTRAN (E-UTRAN) used in LTE.
  • E-UTRAN evolved UTRAN
  • the expression downlink which may be abbreviated DL, is used for the
  • the expression uplink which may be abbreviated UL, is used for the transmission path in the opposite direction i.e. from the wireless device to the base station.
  • Machine Type of Communication has in recent years, especially in the context of the Internet of Things (loT), shown to be a growing market segment for cellular technologies, especially for GSM/EDGE with its more or less global coverage, ubiquitous connectivity and price competitive devices. Realization of loT benefit from utilizing cellular technologies and GSM technology is of great, perhaps of greatest, interest to utilize at least initially. In general it is desirable to be able to (re)use existing wireless
  • An MTC device is typically a wireless device that is a self and/or automatically controlled unattended machine and that is typically not associated with an active human user in order to generate data traffic.
  • a MTC device is typically much more simple, and associated with a more specific application or purpose, than, and in contrast to, a conventional mobile phone or smart phone.
  • MTC involve communication to and/or from MTC devices, which communication typically is of quite different nature and with other requirements than communication associated with e.g. conventional mobile phones and smart phones. In the context of and growth of the loT it is evidently so that MTC traffic will be increasing and thus needs to be increasingly supported in wireless communication networks.
  • a problem related to (re)using existing technologies and systems is that the requirements for the new type of devices are typically different than conventional requirements, e.g. regarding the type and amount of traffic, performance etc.
  • Existing systems have not been developed with these new requirements in mind.
  • traffic generated by new type of devices will typically be in addition to conventional traffic already supported by an existing system, which existing traffic typically needs to continue to be supported by and in the system, preferably without any substantial disturbance and/or deterioration of already supported services and performance.
  • Extended Coverage GSM Internet of Things (EC-GSM-loT) is e.g. discussed in GP- 151039, "New Work Item on Extended Coverage GSM (EC-GSM) for support of Cellular Internet of Things (CloT_EC_GSM)", Ericsson LM, Intel, Gemalto N.V., MediaTek Inc., TeliaSonera AB, Sierra Wireless, S.A., Telit Communications S.p.A., ORANGE, Nokia Networks, Alcatel Lucent.
  • Cellular Internet of Things (loT) is e.g. discussed in 3GPP TR 45.820 V13.0.0, "Cellular System Support for Ultra Low Complexity and Low Throughput Internet of Things".
  • EC-GSM-loT e.g. have had the intention to improve coverage with 20 dB, to improve battery life time, i.e. be more energy efficient, keeping bitrates to minimum and to decrease device complexity.
  • the coverage is improved by for example using blind transmissions of radio blocks while on the data channels the coverage is improved using a combination of blind transmissions and HARQ
  • EC-GSM-loT has previously been named, or referred to as, EC-GSM and even EC- EGPRS.
  • MNOs Mobile Network Operators
  • RANs LTE Radio Access Networks
  • MTC Machine Type Communication
  • the BCCH contains synchronization channels, e.g. the Frequency Correction CHannel (FCCH) and the Synchronization CHannel (SCH), the Broadcast CHannel (BCCH) and Common Control CHannels (CCCH).
  • FCCH Frequency Correction CHannel
  • SCH Synchronization CHannel
  • BCCH Broadcast CHannel
  • CCCH Common Control CHannels
  • DL downlink
  • PCH Paging Channel
  • AGCH Access Grant Channel
  • the PCH is used to start a network initiated connection, to page a MS, while the AGCH is used to assign resources to a MS that has sent an access request to the NW over the Random Access Channel (RACH).
  • RACH Random Access Channel
  • the PCH and AGCH are sent with full power to secure that all mobiles addressed are within coverage of these channels.
  • a second reason for using full power on these channels is to allow for a fair comparison of cell signal strengths as measured over the BCCH carriers in a network by any given MS monitoring cells to camp on, i.e. where a MS only needs to know when timeslot 0 occurs on any given BCCH carrier in order to evaluate the cell signal strength.
  • an object is to provide one or more improvements in a wireless communication network, and in particular such that facilitate deployment of EC-GSM-loT.
  • the object is achieved by a method, performed by a wireless communication network, for selecting downlink output power to be used by the wireless communication network for transmitting to the device.
  • the wireless communication network receives an uplink signal from the device when the device accesses the wireless communication network on a random access channel. Further, the wireless communication network estimates signal strength of the received signal and obtains information on output power used by the device for sending the uplink signal. The wireless communication network then estimates a path loss based on the estimated signal strength and the obtained information on uplink output power, and selects the downlink output power based on the estimated path loss.
  • the object is achieved by a computer program comprising instructions that when executed by a network node comprised in a wireless communication network causes the wireless communication network to perform the method according to the first aspect.
  • the object is achieved by a computer readable medium comprising the computer program according to the second aspect.
  • the object is achieved by a network node for selecting downlink output power to be used by a wireless
  • the network node being configured to be comprised in the wireless communication network.
  • the network node is further configured to receive an uplink signal from the device when the device accesses the wireless communication network on a random access channel.
  • the network node is configured to estimate signal strength of the received signal.
  • the network node is also configured to obtain information on uplink output power used by the device for sending the uplink signal.
  • the network node is configured to estimate a path loss based on the estimated signal strength and the obtained information on uplink output power and to select the downlink output power based on the estimated path loss. Thanks to the estimated path loss, the wireless communication network, e.g. the network node, then can, e.g.
  • select the downlink power to be lower than conventionally would be selected, e.g. lower than a maximum allowed downlink output power, but that still is sufficient for reaching the device, or in other words, so that the device still remains within downlink coverage.
  • Using lower downlink output power in this way allows for decreased interference between cells and makes it easier for wireless devices, e.g. mobile stations in a GSM network, such as supporting EC-GSM- loT, to detect and distinguish individual cells. This may be particularly advantageous if there is a decrease of the reuse on the Broadcast Channel (BCCH) frequency layer due to frequency re-farming, such as discussed in the Background.
  • BCCH Broadcast Channel
  • embodiments herein provide improvements compared to a conventional wireless communication network, especially a conventional wireless communication network supporting GSM, and facilitates deployment of EC-GSM-loT.
  • embodiments herein enable reduced interference levels that in turn improve spectral efficiency in e.g. wireless communication networks supporting
  • Figure 1 is a block diagram schematically depicting an example of a wireless communication network in which embodiments herein may be implemented.
  • Figure 2 is a combined signaling diagram and flowchart for describing some embodiments herein.
  • FIG 3 is a flowchart schematically illustrating some embodiments herein, involving an Access Grant CHannel (AGCH).
  • AGCH Access Grant CHannel
  • FIG. 4 is a is a flowchart schematically illustrating some embodiments herein, involving a Paging CHannel (PCH).
  • PCH Paging CHannel
  • Figure 5 is a flowchart schematically illustrating some embodiments herein in the context of a detailed example with power levels.
  • Figure 6 is a flowchart schematically illustrating a method according to embodiments herein.
  • Figure 7 is a functional block diagram for illustrating embodiments of a network node according to embodiments herein and how it can be configured to carry out the method.
  • Figures 8a-c are schematic drawings illustrating embodiments relating to computer programs and computer readable media to cause the network node to perform the method.
  • the BCCH carrier is deployed with a frequency reuse of 12 which implies that every 12th cell will transmit on the same Absolute Radio Frequency Channel Number (ARFCN).
  • ARFCN Absolute Radio Frequency Channel Number
  • the high reuse factor is intended to secure that a MS will detect BCCH carriers on the same ARFCN but from two difference cells with a significant power imbalance.
  • MS any given device, typically named MS in GSM and may also be named so in the following, to distinguish cells from each other simply by measuring the received signal strength on the BCCH carrier ARFCN allocated to each cell. It also keeps interference levels at moderate levels which supposedly allow reliable decoding of the information carried over the BCCH carrier.
  • EC-GSM-loT For EC-GSM-loT the situation is somewhat different compared to GSM/EDGE. It has been mandated that signal strength measurements shall only be performed over the synchronization channels, the EC-FCCH and EC-SCH. This allows EC-GSM-loT devices to perform signal strength measurements using timeslot 1 of the BCCH carrier occurring within TDMA frames that are not used for EC-PCH and EC-AGCH thereby allowing the network to down regulate the DL output power on timeslot 1 occurring within TDMA frames used for sending EC-PCH and EC-AGCH messages.
  • CN Core Network
  • SGSN Serving GPRS Support Node
  • CC Coverage Class
  • EC-GSM-loT devices are expected to be stationary or of low mobility, meaning that their CC is expected to be fairly time invariant. It was also mandated that EC-GSM-loT device, shall estimate its CC and when detecting a change, at least when going from better to worse coverage, initiate a connection to notify the network about the change. It could hence be expected that the network at all times will have an accurate estimate of a device's coverage situation.
  • 3GPP TR 45.820 V13.0.0 Cellular System Support for Ultra Low Complexity and Low Throughput Internet of Things already mentioned in the Background. See in particular section 6.2 about EC-GSM.
  • the latest path loss estimate may either be based on a recently received EC-RACH transmission or based on a path loss estimate stored in the network, or based on a weighted sum of these two estimates.
  • the network may receive an EC-RACH transmission that indicates the sending device is retrying due to failing to receive a response on the EC-AGCH that matches its last EC-RACH transmission. In this case it may also upregulate the power on the EC- AGCH using a higher DL output power level for the at least the next message sent to that device.
  • GSM/EDGE CCCH/D GSM/EDGE CCCH/D. If doing so care should however be taken not to impact e.g. cell reselection performance.
  • Some embodiments herein may thus be considered to introduce so called open loop power control for (EC-)CCCH/D which allows for reduced interference levels to improve spectral efficiency in wireless communication networks employing GSM/EDGE, including e.g. EC-GSM-loT.
  • Figure 1 is a schematic block diagram schematically depicting an example of a wireless communication network 100 in which embodiments herein may be
  • the wireless communication network 100 is typically a telecommunication network or system, such as a cellular communication network that may be a GSM network or a wireless communication network that supports GSM and/or EC-GSM-loT. It may comprise a RAN 101 part and a core network (CN) 102 part.
  • a cellular communication network such as a GSM network or a wireless communication network that supports GSM and/or EC-GSM-loT. It may comprise a RAN 101 part and a core network (CN) 102 part.
  • CN core network
  • a radio network node 110 is shown comprised in the wireless communication network 100 and in the RAN 101.
  • the radio network node 110 may be a radio network node as illustrated in the figure and may be or be comprised in a Base Station Subsystem (BSS), e.g. such supporting GSM/EDGE, for example when the when the wireless communication network 100 is a GSM network or a GSM based communication network, e.g. supporting EC-GSM-loT.
  • the radio network node 1 10 may be or comprise a base station 11 1 , e.g. a Base Transceiver Station (BTS) of said BSS.
  • the radio network node 5 1 10 may further comprise a controlling node 1 12 of a base station, which may control one or more base stations, including e.g. the base station 1 11 , and may be a Base Station Controller (BSC) of said BSS.
  • BSC Base Station Controller
  • the radio network node 110 may serve and/or control and/or manage one or more devices, typically wireless devices, e.g. MSs, such as a
  • the wireless device 120 may be of any type discussed herein, but is typically a MTC device and/or support EC-GSM-loT and/or operate according to EC-GSM-loT.
  • a core network node 130 may be comprised in the wireless
  • the core network node 130 may be a Serving GPRS Support Node (SGSN) when the wireless communication network 100 is a GSM network or a GSM based communication network.
  • SGSN Serving GPRS Support Node
  • the wireless device 120 may communicate with and/or via the core network node 130 over a radio network node, e.g. the network node 110.
  • the CN 102 may provide0 access for the wireless device to an external network 140, e.g. the Internet.
  • the wireless device 120 may thus communicate via the RAN 101 and the CN 102 with the external network 140.
  • the wireless communication network 100 is a GSM network or a GSM based communication network, such as one supporting EC-GSM-loT
  • the access to the external network is typically via a Gateway GPRS Support Node (GGSN), such as the5 GGSN 131 illustrated in the figure, which is an example of a further core network node.
  • GGSN Gateway GPRS Support Node
  • the wireless communication network 100 including relevant nodes thereof, e.g. the radio network node 110, and the wireless device 120, typically support, and/or are configured to operate according to, EC-GSM-loT.
  • the wireless communication network 100 then typically supports coverage classes that may be Coverage Classes (CCs), such0 as defined for EC-GSM-loT.
  • CCs are associated with different coverage, such as different coverage extension, respectively.
  • “coverage class”, or simply "CC” may more generally refer to a certain ability of a device, e.g. the wireless device 120, to communicate with the wireless communication network 100 from a certain location and/or under certain conditions.
  • Devices that are assigned and thereby operate5 according to different CCs typically have different ability to communicate with the wireless communication network although located at the same location.
  • a CC associated with a device typically determines a number of so called blind repetitions to be used in communication with the device.
  • a worse coverage typically requires more such repetitions and thereby a higher CC.
  • the wireless device 120 may be associated with, e.g. may support or operate according to, one or more, typically one, or at least one at a time in the uplink and/or downlink, of said coverage classes that the wireless communication network 100 supports.
  • Coverage classes of the downlink and uplink may not need to be the same, i.e. may be different.
  • Figure 1 is only schematic and for exemplifying purpose and that not everything shown in the figure may be required for all embodiments herein, as should be evident to the skilled person.
  • a wireless communication network or networks that in reality correspond(s) to the wireless communication network 100 will typically comprise several further network nodes, such as base stations, etc., as realized by the skilled person, but which are not shown herein for the sake of simplifying.
  • FIG. 2 depicts a combined signaling diagram and flowchart, which will be used to discuss embodiments herein.
  • the involved nodes as shown in the figure are the wireless communication network 100, that may be exemplified by a network node, such as the radio network node 110, and the wireless device 120.
  • the wireless communication device may be exemplified by a network node, such as the radio network node 110, and the wireless device 120.
  • the methods and actions discussed in the following are for selecting downlink output power, e.g. a downlink output power level, to be used for a device, such as for the wireless device 120, i.e. to reach the device.
  • the selected downlink output power level may be used when addressing the wireless device 120 on a PCH, e.g. a PCH being used in GSM and/or for EC-GSM-loT, thus e.g. a EC-PCH, and/or on a AGCH, e.g. a AGCH being used in GSM and/or for EC-GSM-loT, thus e.g. an EC-AGCH.
  • Action 201 is for selecting downlink output power, e.g. a downlink output power level, to be used for a device, such as for the wireless device 120, i.e. to reach the device.
  • the selected downlink output power level may be used when addressing the wireless device 120 on a PCH, e.g.
  • the wireless communication network 100 receives an uplink signal from the wireless device 120 when the wireless device 120 accesses the wireless communication network 100 on a random access channel, e.g. a RACH being used in GSM and/or for EC-GSM-loT, thus e.g. an EC-RACH.
  • a random access channel e.g. a RACH being used in GSM and/or for EC-GSM-loT, thus e.g. an EC-RACH.
  • the uplink signal being received may be associated with the random access channel and/or be received over and/or be received in response to that the wireless device 120 has accessed the wireless communication network 100 on the random access channel.
  • the wireless communication network 100 e.g. the radio network node 110, estimates signal strength of the received signal.
  • the wireless communication network 100 obtains information on output power of the wireless device 120, i.e. uplink output power.
  • the output power may thus be associated with, such as used, by the wireless device 120 for sending the uplink signal.
  • the present action may comprise receiving the information on output power, e.g. the information may be obtained by reception, fully or partly from the wireless device 120 and/or from, another network node comprised in the wireless communication network 100 and that has access to this information.
  • the information may e.g. be comprised in a random access channel request message, e.g. as described elsewhere herein.
  • the present action comprises determining and/or estimating and/or assuming or even guessing the output power.
  • Action 204 determines and/or estimating and/or assuming or even guessing the output power.
  • the wireless communication network 100 e.g. the radio network node 110 estimates a path loss based on, such as from, the estimated signal strength and the obtained output power.
  • the path loss is thus estimated for the uplink.
  • the path loss of the downlink may be assumed to be the same or similar and hence the estimated path loss can be used, or in other words is relevant, also for the downlink.
  • information on the estimated path loss is stored in the wireless communication network 100.
  • a network node e.g. the radio network node 110, such as a BSS
  • a core network node e.g. the core network node 130, such as a SGSN
  • the wireless communication network 100 selects the downlink output power, e.g. a power level, based on the estimated path loss.
  • the downlink output power may be selected based on a most recent estimated path loss and/or on an estimated path loss previously, such as last, stored in the wireless communication network 100.
  • the estimated path loss may be an estimated path loss that previously was sent to the core network node 130, e.g. SGSN, by the radio network node 110, e.g. BSS.
  • the downlink output power is selected based on both the most recent estimated path loss and an estimated path loss previously stored in the wireless communication network, it may be based on a weighted sum of these two estimates, for example with a "forgetting factor" taking into account the time passed since the estimated path loss was stored. That is, the estimated path loss previously stored in the wireless communication network 100 may have a reduced importance compared to the most recent estimated path loss as time goes on.
  • a downlink power can be selected that is lower than conventionally would be selected, e.g. lower than a maximum allowed downlink output power, but that still is sufficient for reaching the device, or in other words, so that the device still remains within downlink coverage.
  • Using lower downlink output power in this way allows interference between cells to decrease and makes it easier for wireless devices, e.g. mobile stations in a GSM network, such as supporting EC-GSM-loT, to detect and distinguish individual cells, in particular if there is a decrease of the reuse on the BCCH frequency layer, due to frequency re-farming such as discussed in the
  • embodiments herein provide improvements compared to a conventional wireless communication network, especially a conventional wireless communication network supporting GSM, and facilitates deployment of EC-GSM-loT.
  • embodiments herein enable reduced interference levels that in turn improve spectral efficiency in e.g. wireless communication networks supporting
  • GSM/EDGE and/or EC-GSM-loT.
  • Embodiments herein may be considered to relate to a so called open loop power control that may be applied to the CCCH/D in GSM/EDGE and/or to the corresponding channel, that may be named EC-CCCH/D in case of EC-GSM-IOT.
  • the method may further comprise one or more of the following actions: Action 206
  • the wireless communication network 100 may send information to the wireless device 120 while using the selected downlink output power, e.g. sending the information when addressing the wireless device 120 on said (EC-)PCH and/or on said (EC-)AGCH.
  • the information may be a message and may be sent as an attempt to reach the wireless device 120 with such message on said (EC-)PCH and/or on said (EC-)AGCH.
  • the wireless communication network 100 may increase, e.g. up-regulate, the selected downlink output power in response to that the wireless device 120 has not responded to the information that was sent while using the selected downlink output power, e.g. not respond to an initial attempt, as in Action 206, to reach the wireless device 120 with said information, e.g. said message, for example on said (EC-)PCH and/or on said (EC-)AGCH.
  • the wireless communication network 100 may then again send the information to the wireless device 120 but now using the increased selected downlink output power, i.e. in another attempt to reach the wireless device 120 with the information, e.g. said message.
  • a higher output power may in Action 207 be selected than previously was selected if the wireless device 120 has not responded to the information that was sent in action 206 while using a previously selected output power.
  • the first, i.e. initially, selected output power is thus the output power selected in Action 206 above, then there may, in action 207 be one or more output powers subsequently and increasingly selected to be higher than the previous ones and that are used for sending the information in the present action.
  • the selected output power may be further increased etc., or in other words, the downlink output power may be increased, typically in predefined or predetermined steps.
  • the information is sent again etc., until the wireless device 120 responds or until a maximum allowed and/or possible downlink output power has been reached and/or been used for sending the information.
  • the need to make another attempt to send the information, e.g. on the EC-PCH and/or EC-AGCH, using an increased, i.e. higher, downlink output power, may be based on that the wireless communication network 100, typically a network node thereof, such as the radio network node 110, is detecting that the device is not transmitting on its assigned radio resources according to the information.
  • the wireless device 120 supports EC-GSM-loT, and thus may be referred to as a EC-GSM-loT device, and it does not respond
  • its coverage class i.e. a coverage class associated with the wireless device 120 in the downlink
  • selecting a higher coverage class may be alternative to or be in addition to increasing the selected downlink output power in Action 206. Selecting a higher coverage class may e.g. be done when, or in response to that, maximum allowed and/or possible downlink output power has been reached and/or been used for sending the information. Similarly as above, the coverage class may be increased, typically in predefined of predetermined steps, the information may be sent again etc., until the wireless device 120 responds or until a maximum allowed and/or possible coverage class has been reached and/or been used for sending the information.
  • FIG. 3 illustrates some embodiments herein that may be described as relating to an open loop power control for the (EC-)AGCH applicable at originating access of an MS, e.g. the wireless device 120.
  • the (EC-)AGCH may refer to the AGCH in GSM or EC- AGCH in EC-GSM-loT, i.e. an AGCH specific for EC-GSM-loT.
  • the DL CC as well as the DL path loss of each addressed MS should be taken into account when determining the output power of the BTS, e.g. of the radio network node 110, i.e. downlink output power level, for the EC-AGCH.
  • the MS e.g. wireless device 120
  • This action may fully or partly correspond to action 201 as described above.
  • the BS e.g. the radio network node 1 10 estimates signal strength on the (EC-RACH), e.g. using the signal being received in action 301 , and decodes a (EC- )RACH channel request message and may thereby read information a DL CC and used output power of the wireless device 120.
  • This action may fully or partly correspond to action 202 as described above.
  • action 303 it is checked if the DL CC is DL CC1.
  • a downlink path loss is calculated and stored in a SGSN, e.g. the core network node 130.
  • the path loss is used to down regulate BTS, e.g. of the radio network node 110, output power for the (EC-)AGCH.
  • This action may fully or partly correspond to action 205 as described above.
  • a maximal BTS e.g. of the radio network node 110
  • output power is used for the (EC-) AGCH. This action may fully or partly correspond to action 205 as described above.
  • the BTS e.g. of the radio network node 1 10, transmits on the
  • action 307 it is checked if the MS, e.g. wireless device 120, responds to what was transmitted on the (EC-)AGCH in action 306. If the MS, e.g. wireless device 120 does not respond, then in action 308, the power level of the (EC-)AGCH is increased. If a maximal power level is reached, a coverage class used for the (EC-)AGCH, i.e. a
  • (EC-)AGCH CC may be increased.
  • Action 306 is then performed again etc. These actions may fully or partly correspond to actions 207 and 208 as described above.
  • Figure 4 illustrates some further embodiments herein that may be described as relating to an open loop power control for the (EC-)PCH, instead of the (EC-)AGCH as in Figure 3, applicable at originating access by a wireless communication network, e.g. the wireless communication network 100.
  • a wireless communication network e.g. the wireless communication network 100.
  • the DL CC as well as the DL path loss of each addressed MS, should be taken into account when determining the output power of the BTS, e.g. of the radio network node 1 10, i.e. downlink output power level for the (EC-)PCH.
  • a SGSN e.g. core network node 130
  • a BSS e.g. the radio network node 110
  • attaches thereto information on DL CC and path loss associated with the paged MS e.g. the wireless device 120.
  • This action may fully or partly correspond to action 202 as described above.
  • the BSS e.g. the radio network node 110, thereby obtains this information.
  • This action may fully or partly correspond to actions 201-204 as described above.
  • action 402 it is checked if the DL CC is DL CC1.
  • the DL CC is DL CC1 , which may indicate normal coverage, then, in action 403, it is down-regulated BTS, e.g. of the radio network node 110, output power for the (EC- )PCH.
  • the path loss may be used to down-regulate the output power.
  • This action may fully or partly correspond to action 205 as described above.
  • a maximal BTS e.g. of the radio network node 110, output power is used for the (EC-) PCH. This action may fully or partly correspond to action 205 as described above.
  • the BTS e.g. of the radio network node 1 10, transmits on the (EC- )PCH, as should be understood, using the BTS output power from action 403 or 404.
  • This action may fully or partly correspond to action 206 as described above.
  • action 406 it is checked if the MS, e.g. wireless device 120, responds to what was transmitted on the (EC-)PCH in action 405. If the MS, e.g. wireless device 120, does not respond, then in action 407, the power level of the (EC-)PCH is increased. If a maximal power level is reached, a coverage class used for the (EC-)PCH, i.e. a (EC-)PCH CC, may be increased. Action 405 is then performed again etc. These actions may fully or partly correspond to actions 207 and 208 as described above.
  • a device nominal maximum output power is determined by a power class. GSM devices typically use 33 dBm while for EC-GSM-loT devices the power may in practice be 23 dBm or 33 dBm.
  • SI System Information
  • BCCH contains a Cell Selection Parameters IE, which includes a "MS-TXPWR-MAX-CCH"- field which is 5 bits long. This field controls the maximum power level a device can use on the RACH and is coded as:
  • Similar functionality can also be considered desirable or needed for EC-GSM-loT to control the EC-RACH power.
  • the used output power on the (EC-)RACH will equal the highest of the device nominal output power and the value signaled in the "(EC-)MS-TXPWR-MAX-CCH"- field.
  • a BSS e.g. the radio network node 110
  • the drawback of receiving MS RAC during contention resolution is that the device, e.g. the wireless device 120, will have to transmit an additional radio block carrying this information and thereby consumes battery, wherein the additional radio block is transmitted using the same output power level used for sending the EC-RACH request.
  • the drawback of the BSS, e.g. the radio network node 1 10, receiving MS RAC from the network, e.g. the wireless communication network 100, after contention resolution is that the BSS, e.g. the radio network node 1 10, has already transmitted an uplink assignment message on the EC- AGCH without the possibility of down regulating the output power level of the BTS, i.e. BTS of the BSS and thus e.g. of the radio network node 110.
  • the device output power e.g. of the wireless device 120
  • the (EC-)RACH request can be assumed to be transmitted at maximal nominal output power level, any one the following 3 methods may be used:
  • the (EC-)RACH request may make use of distinct Training Sequence Codes (TSC) to indicate what the nominal maximum output power of the wireless device 120 is, e.g. whether the nominal maximum output power of the device is 23 dBm or 33 dBm.
  • TSC Training Sequence Codes
  • the (EC-)RACH request may comprise, e.g. be extended, with an information field indicating the nominal output power.
  • an information field indicating the nominal output power.
  • EC-GSM-loT channel request a single bit may be sufficient to indicate the max device power level as 23dBm or 33dBm.
  • the BSS involved e.g. the radio network node 1 10, can make a qualified guess of used output power by the wireless device 120. Most devices, at least in GSM and EC-GSM-loT, will likely use 33 dBm output power, but some might use 23 dBm. So a conservative guess may be that all devices use 23 dBm output power.
  • the (EC-)RACH request may be transmitted at a level below maximal nominal output power, e.g. other than 23 dBm or 33 dBm, a signaling of finer granularity than allowed by any of the 3 methods above may be needed for indicating the actual output power level used by the device. Therefore also a 4th method is proposed and may be used:
  • the (EC-)RACH request may indicate the down-regulation (if any) used by the device from the nominal maximum output power.
  • a simple approach is to indicate if power is down-regulated beyond a certain pre-defined and/or predetermined value, for example 6 dB, which would minimize the information that need to be carried in the (EC-)RACH request.
  • a more general approach may instead be to signal the down-regulated power with a certain granularity.
  • table 6.2.4.6-3 proposes a 3 bit information element for signaling of the DL CC.
  • 4 CCs are configured the meaning of this three bit field can be expanded to signal DL CC as well as a range in which the used output power on the EC-RACH falls.
  • Table 1 An example is presented below in Table 1.
  • CCCH/D power control will be limited to devices in CC1.
  • the value X can either be signaled e.g. in the SI, or be a predefined value fixed in a standards specification.
  • the BSS may calculate an uplink coupling loss, i.e. path loss, and use the same to select a DL output power level of the BTS, i.e. BTS of the BSS, and thus e.g. of the radio network node 110. That is, use it to down-regulate the BTS output power, when addressing the wireless device 120 over the (EC-)AGCH, such that the wireless device 120 remains within coverage when the selected output power level is less than what would otherwise be used if path loss was not estimated, thereby minimizing interference to neighbouring cells.
  • an uplink coupling loss i.e. path loss
  • a MS e.g. the wireless device 120, transmits on the EC-RACH using a 33 dBm output power.
  • the BTS e.g. BTS of the radio network node 110
  • a signal level from the EC-RACH As the transmission on the EC-RACH is received, so is also an indication from the wireless device 120 regarding its use of the 33 dBm output power.
  • This action may fully or partly correspond to actions 201 and 203 as described above.
  • the BTS i.e. of the radio network node 110
  • may in action 504 make the assumption that the wireless device 120 requires a received signal level of at least -104 dBm, and may then determine the required DL transmission power to 104+143 39 dBm. If is assumed that a nominal maximum output power of the BTS, e.g. of the radio network node 1 10, is 43 dBm, this implies a 4 dB reduction is possible on the EC-CCCH.
  • This action may fully or partly correspond to action 205 as described above.
  • the BTS e.g. of the radio network nod 1 10
  • the BTS e.g. of the radio network node 110, may then, in action 506, send to the wireless device 120 on the EC-AGCH using 39 dBm output power.
  • This action may fully or partly correspond to action 206 as described above.
  • the BSS may further include the estimated uplink coupling loss, i.e. path loss, when sending a next uplink LLC PDU to the SGSN, e.g. the core network node 130, for example via a Base Station System GPRS Protocol (BSSGP) and it may then be maintained indefinitely by the SGSN.
  • BSSGP Base Station System GPRS Protocol
  • down-regulation for the (EC-)PCH may only be possible if the BSS, e.g. the radio network node 110, when earlier in time estimating the DL path loss, provides the DL path loss information to the network, e.g. the wireless communication network 100, which then stores it.
  • Subsequent paging requests sent by a SGSN, e.g. the core network node 130, may include the most recently stored uplink coupling or path loss value for the target device, e.g. the wireless device 120, thereby allowing pages sent on the (EC-)PCH to only use a necessary power level required for reaching the target device.
  • the same down regulated power level may be taken into account as the network will, as a result of receiving an EC-RACH transmission from a 5 device attempting to send a page response, have an updated estimate of UL path loss which it can use to determine the applicable DL path loss, see e.g. the discussion above about the forgetting factor.
  • the SGSN e.g. the core network node 130
  • the BSS e.g. the radio network node 110
  • a so called "DL-UNITDATA" PDU a so called "DL-UNITDATA" PDU.
  • a ready 10 timer may be running and the SGSN, e.g. the core network node 130, has DL data to deliver to a device, e.g. the wireless device 120.
  • the stored DL path loss information may be included therein, thereby allowing the BTS, e.g. of the radio network node 1 10, to apply down-regulation when transmitting the downlink assignment message used to assign the required DL radio resources.
  • Figure 6 is a flow chart schematically illustrating embodiments of a
  • the method is for selecting downlink output power to be used for a device that is exemplified by the wireless device
  • the downlink output power is output power to be used by the
  • the wireless communication network 100 for transmitting to the wireless device 120, i.e. to reach the wireless device 120.
  • the wireless communication network 100 is preferably a GSM network that supports EC-GSM-loT.
  • the second method is performed by a network node, e.g. the radio network node 1 10, comprised in the wireless
  • the method comprises the following actions, which actions may be taken in any suitable order and/or be carried out fully or partly overlapping in time when this is possible and suitable.
  • the wireless communication network 100 receives an uplink signal from the wireless device 120 when the wireless device 120 accesses the wireless communication network 100 on a random access channel.
  • This action may fully or partly correspond to action 201 as described above.
  • the wireless communication network 100 estimates signal strength of the received signal.
  • This action may fully or partly correspond to action 202 as described above.
  • the wireless communication network 100 obtains information on uplink output power used by the device 120 for sending the uplink signal.
  • the information on uplink output power may be obtained by being received from the wireless device 120.
  • the information on uplink output power is comprised in a random access channel request.
  • Action 604 This action may fully or partly correspond to action 203 as described above. Action 604
  • the wireless communication network 100 estimates path loss based on the estimated signal strength and the obtained information on uplink output power.
  • the estimated path loss is stored in the wireless
  • the communication network 100 for later use and the downlink output power is selected based on the stored estimation.
  • This action may fully or partly correspond to action 204 as described above.
  • the wireless communication network 100 selects the downlink output power based on the estimated path loss.
  • the downlink output power is selected based on the estimated path loss most recently estimated.
  • This action may fully or partly correspond to action 205 as described above.
  • the wireless communication network 100 may then send information to the wireless device 120 while using the selected downlink output power.
  • Action 607 This action may fully or partly correspond to action 206 as described above. Action 607
  • the wireless communication network 100 may, in response to that the wireless device 120 has not responded to the information that was sent while using the selected downlink output power, increase the selected downlink output power and/or select a 5 higher coverage class to be used with the wireless device 120 in the downlink.
  • This action may fully or partly correspond to action 206 as described above.
  • Figure 7 is a schematic block diagram for illustrating embodiments of a network node 700, that may be the radio network node 110 discussed above, and how it may be 10 configured to perform the method and/or one or more actions described herein relating to said node, e.g. for being performed by, said node.
  • the network node 700 is thus configured to be comprised in the wireless communication network 100 and the network node 700 may comprise:
  • a processing module 701 such as a means, one or more hardware modules, 15 including e.g. one or more processors, and/or one or more software modules for
  • a memory 702 which may comprise, such as contain or store, a computer program 703.
  • the computer program 703 comprises 'instructions' or 'code' directly or indirectly executable by the network node 700 so that it performs the said method and/or 20 actions.
  • the memory 702 may comprise one or more memory units and may be further be arranged to store data, such as configurations and/or applications involved in or for performing functions and actions of embodiments herein.
  • the processing module 25 701 may comprise, e.g. 'is embodied in the form of or 'realized by' the processing circuit
  • the memory 702 may comprise the computer program 703 executable by the processing circuit 704, whereby the network node 700 is operative, or configured, to perform said method and/or actions.
  • An Input/Output (I/O) module 705, configured to be involved in, e.g. by 30 performing, any communication to and/or from other units and/or nodes, such as sending and/or receiving information to and/or from other external nodes or devices.
  • the I/O module 705 may be exemplified by an obtaining, e.g. receiving, module and/or a sending module, when applicable.
  • the network node 700 may also comprise other exemplifying hardware and/or software module(s) as may have been described elsewhere in the present disclosure, which module(s) may be fully or partly implemented by the respective processing circuit.
  • the network node 600 may further comprise a receiving module 5 706 and/or an estimating module 707 and/or an obtaining module 708 and/or a selecting module 709 and/or a sending module 710 and/or an increasing module 711.
  • the wireless communication network 100 e.g. the network node 700 and/or the processing module 701 and/or the processing circuit 704 and/or the I/O module 705 and/or the receiving module 706, are operative, or configured, to receive said uplink0 signal from the wireless device 120 when the wireless device 120 accesses the wireless communication network 100 on the random access channel.
  • the wireless communication network 100 e.g. the network node 700 and/or the processing module 701 and/or the processing circuit 704 and/or the estimating module 707, are operative, or configured, to estimate the signal strength of the received5 signal.
  • the wireless communication network 100 e.g. the network node 700 and/or the processing module 701 and/or the processing circuit 704 and/or the I/O module 705 and/or the obtaining module 708, are operative, or configured, to obtain said information on uplink output power used by the wireless device 120 for sending the uplink0 signal.
  • the wireless communication network 100 e.g. the network node 700 and/or the processing module 701 and/or the processing circuit 704 and/or the I/O module 705 and/or the obtaining module 708, are further operative, or configured, to obtain the information on uplink output power by receiving it from the wireless device 120.
  • the wireless communication network 100 e.g. the network node 700 and/or5 the processing module 701 and/or the processing circuit 704 and/or the estimating module 707, are operative, or configured, to estimate the path loss based on the estimated signal strength and the obtained information on uplink output power.
  • the wireless communication network 100 e.g. the network node 700 and/or the processing module 701 and/or the processing circuit 704 and/or the0 estimating module 707, are further operative, or configured, to store the estimated path loss in the wireless communication network 100 for later use.
  • the wireless communication network 100 e.g. the network node 700 and/or the processing module 701 and/or the processing circuit 704 and/or the selecting module 709, are operative, or configured, to select the downlink output power based on5 the estimated path loss.
  • the wireless communication network 100 e.g. the network node 700 and/or the processing module 701 and/or the processing circuit 704 and/or the selecting module 709, are further operative, or configured, to select the downlink output power based on the estimated path loss most recently estimated.
  • the wireless communication network 100 e.g.
  • the network node 700 and/or 5 the processing module 701 and/or the processing circuit 704 and/or the selecting module 709, are further operative, or configured, to select the downlink output power based on said estimated path loss stored in the wireless communication network 100 for later use.
  • the wireless communication network 100 e.g. the network node 700 and/or the processing module 701 and/or the processing circuit 704 and/or the I/O module
  • the sending module 710 may be operative, or configured, to send information to the wireless device 120 while using the selected downlink output power.
  • the wireless communication network 100 e.g. the network node 700 and/or the processing module 701 and/or the processing circuit 704 and/or the sending module 710, may be operative, or configured, to, in response to that the wireless device
  • Figures 8a-c are schematic drawings illustrating embodiments relating to a 20 computer program that may be the computer program 703, and that comprises
  • the processing circuit 704 causes the network node 700, e.g. the radio network node 110, to perform the method and/or actions as described above.
  • a computer program product i.e. a data 25 carrier, comprising a computer-readable medium and the computer program stored on the computer-readable medium.
  • computer readable medium may be excluded a transitory, propagating signal and the computer readable medium may correspondingly be named non-transitory computer readable medium.
  • Non-limiting examples of the computer- readable medium is a memory card or a memory stick 801 as in Figure 8a, a disc
  • the mass storage device 803 is typically based on hard drive(s) or Solid State Drive(s) (SSD).
  • the mass storage device 803 may be such that is used for storing data accessible over a computer network 805, e.g. the Internet or a Local Area Network (LAN).
  • the computer program may furthermore be provided as a pure computer program or comprised in a file or files.
  • the file or files may be stored on the computer-readable medium and e.g. available through download e.g. over the computer network 805, such as from the mass storage device 803 via a server.
  • the server may e.g. be a web or File Transfer Protocol (FTP) server.
  • FTP File Transfer Protocol
  • the file or files may e.g. be executable files for direct or indirect download to and execution in the wireless communication network 100, such as on the network node 700, e.g. the radio network node 110, for carrying out said and/or actions, e.g. by the processing circuit 704, or may be for intermediate download and compilation to make them executable before further download and execution causing the wireless communication network 100, e.g. the network node 700 thereof, to perform the method and/or actions as described above.
  • any hardware module(s) and/or circuit(s) mentioned in the foregoing may e.g. be included in a single ASIC or FPGA, or be distributed among several separate hardware components, whether individually packaged or assembled into a System-on-a-Chip (SoC).
  • SoC System-on-a-Chip
  • modules and circuitry discussed herein may refer to a combination of hardware modules, software modules, analog and digital circuits, and/or one or more processors configured with software and/or firmware, e.g. stored in memory, that, when executed by the one or more processors make the wireless communication network 100 and/or network node 700 to be configured to and/or to perform the above-described method and/or actions.
  • Identification by any identifier herein may be implicit or explicit.
  • the identification may be unique in the wireless communication network 100 or at least in a part or some area thereof.
  • network node may as such refer to any type of radio network node, described below, or any network node, which may communicate with at least a radio network node.
  • network nodes include any radio network node stated above, a core network node, Operations & Maintenance (O&M), Operations Support Systems (OSS), Self Organizing Network (SON) node, positioning node etc.
  • radio network node may as such refer to any type of network node serving a wireless device and/or that are connected to other network node(s) or network element(s) or any radio node from which a wireless device receives signals.
  • radio network nodes are Node B, Base Station (BS), Multi-Standard Radio (MSR) node such as MSR BS, eNB, eNodeB, network controller, RNC, Base Station Controller (BSC), relay, donor node controlling relay, Base Transceiver Station (BTS), Access Point (AP), transmission points, transmission nodes, nodes in Distributed Antenna System (DAS) etc.
  • wireless device may as such refer to any type of wireless device arranged to communicate with a radio network node in a wireless, cellular and/or mobile communication system, such as the wireless communication network 100, and may thus be referred to as a wireless communication device.
  • Examples include: target devices, device to device UE, device for Machine Type of Communication (MTC), MTC device, machine type UE or UE capable of machine to machine (M2M) communication, Personal Digital Assistant (PDA), iPAD, Tablet, mobile terminals, smart phone, Laptop Embedded Equipment (LEE), Laptop Mounted Equipment (LME), Universal Serial Bus (USB) dongles etc. While said terms are used frequently herein for convenience, or in the context of examples involving other 3GPP nomenclature, it must be appreciated that the term as such is non-limiting and the teachings herein apply to essentially any type of wireless device.
  • MTC Machine Type of Communication
  • M2M machine to machine
  • PDA Personal Digital Assistant
  • iPAD iPAD
  • Tablet mobile terminals
  • node as used herein may as such refer to any type of network node or wireless device, such as described above.
  • the term “transmitter” may be used herein to refer to a radio network node, e.g. base station, and the term “receiver” may refer to a wireless device.
  • the term "memory” may refer to a hard disk, a magnetic storage medium, a portable computer diskette or disc, a Solid Sate Drive (SSD), a flash memory, a random access memory (RAM) or the like. Furthermore, the memory may be an internal register memory of a processor.
  • any enumerating terminology such as first network node, second network node, first base station, second base station, etc., that may have been used herein, as such should be considering non-limiting and the terminology as such does not imply a certain hierarchical relation. Without any explicit information in the contrary, naming by enumeration should be considered merely a way of accomplishing different names.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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Abstract

L'invention concerne un procédé et un réseau de communication sans fil (100), tel qu'un nœud de réseau (110 ; 700) de ce dernier, pour sélectionner une puissance de sortie de liaison descendante à utiliser pour une émission à destination d'un dispositif (120). Un signal de liaison montante est reçu (201 ; 601) à partir du dispositif (120) lorsqu'il accède au réseau de communication sans fil (100) sur un canal d'accès aléatoire. La puissance de signal du signal reçu est estimée (202 ; 602). Des informations sont obtenues (203 ; 603) sur la puissance de sortie utilisée par le dispositif (120) pour envoyer le signal de liaison montante. Une perte de chemin est estimée (204 ; 604) sur la base de la puissance de signal estimée et des informations obtenues sur la puissance de sortie de liaison montante. La puissance de sortie de liaison descendante est ensuite sélectionnée (205 ; 605) sur la base de la perte de chemin estimée.
PCT/SE2017/050004 2016-01-04 2017-01-03 Sélection d'une puissance de sortie de liaison descendante dans un réseau de communication sans fil WO2017119841A1 (fr)

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US62/274,388 2016-01-04

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Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
"Extended Coverage for GSM, Realizing extended coverage through Coverage Classes", 3RD GENERATION PARTNERSHIP PROJECT 3GPP TSG GERAN1, 2 February 2015 (2015-02-02) *
"System impact from power control settings on EC -RACH", 3RD GENERATION PARTNERSHIP PROJECT 3GPP TSG GERAN MEETING #68, 16 November 2015 (2015-11-16) *

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