WO2012062126A1 - Procédé et appareil d'attribution de ressources radio - Google Patents

Procédé et appareil d'attribution de ressources radio Download PDF

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Publication number
WO2012062126A1
WO2012062126A1 PCT/CN2011/076869 CN2011076869W WO2012062126A1 WO 2012062126 A1 WO2012062126 A1 WO 2012062126A1 CN 2011076869 W CN2011076869 W CN 2011076869W WO 2012062126 A1 WO2012062126 A1 WO 2012062126A1
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value
psd
tbs
current value
current
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PCT/CN2011/076869
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English (en)
Chinese (zh)
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张庆宏
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中兴通讯股份有限公司
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0042—Arrangements for allocating sub-channels of the transmission path intra-user or intra-terminal allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/22—Demodulator circuits; Receiver circuits
    • H04L27/227—Demodulator circuits; Receiver circuits using coherent demodulation
    • H04L27/2271—Demodulator circuits; Receiver circuits using coherent demodulation wherein the carrier recovery circuit uses only the demodulated signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H04L5/006—Quality of the received signal, e.g. BER, SNR, water filling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/543—Allocation or scheduling criteria for wireless resources based on quality criteria based on requested quality, e.g. QoS
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal

Definitions

  • the present invention relates to the field of wireless communications, and in particular to a radio resource allocation method and apparatus.
  • QoS Quality of Service
  • system throughput is the two most important indicators of wireless systems.
  • Interference coordination is the guarantee of system QoS satisfaction, and interference coordination often needs to sacrifice the cell's overall throughput rate in exchange for the increase of Cell edge throughput rate, thereby improving the QoS requirements of more UEs satisfying the entire Cell, and how to satisfy the QoS. Maximizing system throughput has always been a hot topic in wireless communication technology research.
  • the uplink/downlink time-frequency domain physical resources are formed into resource blocks (RBs), which are scheduled and allocated as physical resource units.
  • RB resource blocks
  • a resource block (RB) contains 12 consecutive subcarriers in the frequency domain and 7 consecutive orthogonal frequency divisions in the time domain.
  • the (OFDM) symbol is used, that is, the frequency domain width is 180 kHz, and the time length is 0.5 ms.
  • the base station (eNodeB)'s upper scheduler needs to allocate a certain number of RBs, transmit power, and select an appropriate Modulation Coding Scheme (MCS).
  • MCS Modulation Coding Scheme
  • the total power of a single UE is fixed.
  • a small number of RBs may be allocated to a single UE, and the available power of each UE increases, and the interference to the neighboring cell increases.
  • the technical problem to be solved by the present invention is to provide a radio resource allocation method and apparatus for maximizing system spectral efficiency under the premise of satisfying QoS requirements.
  • the present invention provides a radio resource allocation method, and the method includes:
  • PSD power spectral density
  • UE user equipment
  • the resource allocation signaling is constructed according to the PSD final value and the RB number final value of the current data transmission, and is sent to the UE.
  • the maximum value of the PSD is ⁇ min , / ⁇ , / 3 ⁇ ) , or
  • P cMAX ' P 1nghe St MCS , PMAX ⁇ PSD is the maximum value
  • Hlill is the minimum value
  • P eM4x is the maximum transmit power of the UE
  • teiM ⁇ is required to satisfy the highest order adjustment coding mode (MCS).
  • MCS highest order adjustment coding mode
  • the PSD initial value and the RB number initial value are adjusted according to the service QoS requirement of the UE, and the final value of the PSD final value and the RB number of the current data transmission are:
  • TBS transmission target transport block size
  • BSR UE Buffer Size Report
  • step (c) determining whether the current value of the TBS satisfies 3 ⁇ 4 > TBS ⁇ TBS RE - , if yes, using the current value of the PSD and the current value of the RB number as the final value of the PSD and the final value of the RB number of the current data transmission; If the current value is greater than 3 ⁇ 43 ⁇ 4 ⁇ , the TBS is adjusted to the TBS BSR , and the current value of the PSD and the number of RBs corresponding to the TBS are respectively used as the final value of the PSD and the final value of the RB number of the current data transmission; if the current value of the TBS is less than 3 ⁇ 43 ⁇ 4 ⁇ One, otherwise step (d) is performed;
  • step (d) According to the adjustment strategy, adjust the current value of the RB number and recalculate the current value of the PSD according to the current value of the adjusted RB number, or adjust the current value of the PSD, and recalculate the current value of the RB number according to the adjusted current value of the PSD. , go to step (b).
  • the adjustment range of the current value of the RB number in the step (d) is the minimum value of the RB number to the available bandwidth of the system idle;
  • the adjustment range of the current value of the PSD is the minimum value of the PSD to the maximum value of the PSD,
  • the minimum PSD is an arbitrary value between the sum of the interference noise and the maximum value of the PSD.
  • the present invention also provides a wireless resource allocation apparatus, the apparatus comprising:
  • a PSD initial value obtaining module configured to: determine a maximum value of a power spectral density (PSD) of the user equipment (UE) as an initial value of the PSD;
  • PSD power spectral density
  • An RB number initial value obtaining module configured to: obtain a minimum value of the resource block (RB) number according to the initial value of the PSD, as an initial value of the RB number;
  • An adaptive module configured to: adjust an initial value of the PSD and an initial value of the RB according to the service QoS requirement of the UE to obtain a final value of the PSD and a final value of the RB of the current data transmission;
  • the signaling construction output module is configured to: construct resource allocation signaling according to the PSD final value and the RB number final value of the current data transmission, and send the resource allocation signaling to the UE.
  • the maximum value of the PSD is ⁇ min , / ⁇ , / 3 ⁇ ) , or
  • PSD is the maximum value
  • Hlill is the minimum value, which is the maximum transmit power of the UE
  • 3 ⁇ 4 ⁇ ⁇ ⁇ is required to satisfy the highest order adjustment coding mode (MCS).
  • MCS highest order adjustment coding mode
  • the RB number initial value obtaining module obtains the initial value of the RB number by using the following formula: ) , where Hlill represents the minimum value, "Table
  • the adaptive module comprises:
  • the resource requirement determining sub-module is configured to: obtain the current transmission target transport block size (TBS) according to the service data rate requirement of the UE, and record it as TBS R — nt ; obtain according to the UE buffer status report (BSR, Buffer Size Report) The corresponding TBS is recorded as TBS BSR ;
  • the TBS current value calculation sub-module is set to: calculate the current value of the TBS according to the channel interference condition and the current value of the PSD and the current value of the RB number;
  • the current value of the PSD and the current value of the RB number are respectively used as the final value of the PSD and the final value of the RB number of the current data transmission; if the current value of the TBS is greater than 3 ⁇ 43 ⁇ 4 ⁇ , the TBS is adjusted to 3 ⁇ 43 ⁇ 4 ⁇ , and the current value of the PSD is corresponding to the TBS.
  • the RB number is used as the final value of the PSD and the final value of the RB number of the current data transmission; if the current value of the TBS is less than 3 ⁇ 43 ⁇ 4 , . remOTi , otherwise the adjustment sub-module is notified to perform adjustment;
  • Adjust the submodule set to: adjust the current value of the RB number according to the adjustment policy, and recalculate the current value of the PSD according to the current value of the adjusted RB number, or adjust the current value of the PSD, and recalculate the RB number according to the adjusted current value of the PSD. a current value, and outputting the current value of the PSD and the current value of the RB number to the TBS current value calculation sub-module.
  • the adjustment range of the current value of the number of RBs output by the adjustment sub-module is the minimum value of the RB number to the available bandwidth of the system idle; the adjustment range of the current value of the PSD output by the adjustment sub-module is the minimum value of the PSD
  • the PSD maximum value is an arbitrary value between the sum of the interference noise and the PSD maximum value.
  • the method and the device of the present invention determine the upper limit of the transmit power of the UE unit RB, that is, the upper limit of the PSD, and the interference to the neighboring cell is the maximum allowed by the system; and the number of RBs obtained by the power factor, that is, the initial number of RBs;
  • the QoS needs to adjust the RB number and PSD of the UE, so that the QoS of the UE is satisfied to ensure that the spectrum efficiency of the system is the highest as possible.
  • FIG. 1 is a flowchart of a radio resource scheduling method according to Embodiment 1 of the present invention.
  • 2 is a schematic diagram of neighbor interference control under two cell networking conditions
  • FIG. 3 is a schematic flowchart of adjusting an initial value of a PSD and an initial value of an RB according to a service QoS requirement of a UE according to Embodiment 1 of the present invention
  • Figure 4 shows the mapping relationship between TBS and MCS and RB number
  • FIG. 5 is a mapping relationship between TBS and MCS and RB number in the LTE R8 protocol.
  • FIG. 6 is a structural block diagram of a radio resource scheduling apparatus according to an embodiment of the present invention. Preferred embodiment of the invention
  • the present invention aims to provide a radio resource allocation method and apparatus for uplink RB allocation, power control, and adaptive modulation and coding (AMC, Automatic Modulation). Coordinate the work to ensure that the system interference level is controlled, so that the network performance can be guaranteed, and the QoS requirements of the UE can be guaranteed to the maximum to achieve the maximum user satisfaction, and under the premise of the limited interference level and the single UE QoS.
  • the system spectrum efficiency is maximized to solve system performance problems caused by improper uplink RB allocation, power control and AMC cooperation in LTE or LTE-Advanced systems.
  • the present invention first determines the upper limit of the power transmission density (PSD, Power Spectrum Density) on the unit RB of the user equipment (UE, User Equipment), and the interference to the neighboring cell is the maximum allowed by the system;
  • PSD Power Spectrum Density
  • the number of RBs obtained by the factor that is, the number of initial RBs.
  • the AMC and power control are performed by the PSD and the interference noise measured by the physical layer and the Signal Interference Noise Ratio (SINR) of the (NI, Noise and Interference) prediction channel.
  • SINR Signal Interference Noise Ratio
  • This embodiment provides a radio resource scheduling method, as shown in FIG. 1, including the following steps: Step 101: Acquire a maximum value of a power spectral density (PSD) of a user equipment (UE), as
  • the neighboring cell interference threshold is initialized.
  • the interference threshold/value of each neighboring cell z and the target IOT of the cell refer to the measured interference power and thermal noise power generated by all UEs in other cells.
  • the target IOT is often the empirical value, or the system is simulated. The following relationship exists: ⁇ ⁇ /TM z ' ⁇ target 1 ⁇ .
  • the neighboring cell ID is set, the serving cell path loss is dB, the path loss of the neighboring cell I is; dB, the maximum value of the transmitting power of the UE unit RB is / ⁇ ie the initial value of the PSD is P pefRB dBm, the maximum transmission of the UE
  • the power is P cMAX
  • the transmit power on the unit RB required to satisfy the highest-order MCS (corresponding to the highest rate of the UE) (that is, the power spectral density required to satisfy the highest-level MCS) is the interference threshold constraint of the PhlghestMCS in this embodiment.
  • the conditions are: PM, as shown in Figure 2, is shown for neighbor cell interference control under two cell networking conditions.
  • PperRB ( ⁇ cMAX, ⁇ highestMCS, ) , where mill ( ⁇ , ⁇ , ⁇ ) means that the smallest of x, y, z;
  • Step 102 Acquire a minimum value of the number of resource blocks (RBs) according to the initial value of the PSD, as an initial value of the RB number; The value is based on the formula: Mailable) , where "represents the next round, indicating the available band
  • Step 103 Adjust an initial value of the PSD and an initial value of the RB according to the service QoS requirement of the UE to obtain a final value of the PSD final value and the RB number of the current data transmission;
  • step 103 specifically includes:
  • TBS Transmission Target Size
  • BSR Buffer Size Report
  • TBS TBS Mapping (MCS, N RB ), where ⁇ C(*) indicates that the matching MCS, ⁇ is obtained according to the input ⁇ and M using the AMC algorithm.
  • ⁇ indicates that the transport block size TBS is matched according to the input MCS and RB number; / is the initial value of the transmit power of the UE unit RB; M is the sum of the interference noise of the current channel, ⁇ is! ⁇ The number of RBs scored.
  • a TBS can be mapped here as TBU MCS'D; the mapping relationship between TBS and MCS and RB number is generally expressed in a table, and three of them are known to determine another item, such as As shown in Fig. 4, given the values of MCS and ⁇ , the TBS can be obtained by looking up the table.
  • the number of RBs is within the allowable range of the system, and step resource blocks are added each time adjustment, until the service QoS requirement is met, the number of RBs reaches a maximum value, or the PSD reaches a minimum value.
  • the adjustment range of the current value of the RB number is the minimum value of the RB number to the available idle bandwidth of the system; the adjustment range of the current value of the PSD is the sum of the interference noise to the maximum value of the PSD.
  • Step 104 Construct resource allocation signaling and send it to the UE.
  • the current value, the current PSD value, the corresponding MCS, and the bandwidth allocation result given in the above steps are constructed according to the format specified by the specific protocol, and the standard resource allocation signaling is constructed and sent to the UE.
  • the adjustment policy when the number of RBs is adjusted, can be flexibly set. For example, the step granularity is fixed to 2 or 3, or randomly increased. If the service requirement is met, the callback is performed again. When the current RB number exceeds the BSR. If necessary, the RB number is reduced, and the number of RBs that can satisfy the service QoS requirement and the smallest possible number is used as the final value of the PSD and the final value of the RB number of the current data transmission.
  • the current value of the PSD may also be adjusted according to the adjustment policy, and recalculated according to the adjusted current value of the PSD.
  • the current value of the RB number may also be adjusted according to the adjustment policy, and recalculated according to the adjusted current value of the PSD.
  • Step 201 Acquire a maximum value of a power spectral density (PSD) of a user equipment (UE), as
  • the PSD maximum value is obtained as an initial value in the same manner as in the first embodiment.
  • the maximum transmit power of the UE is P, or the transmit power highestMCS on the RB of the highest order MCS is required.
  • Step 202 Obtain a minimum value of the number of resource blocks (RBs) according to the initial value of the PSD, as an initial value of the RB number;
  • Step 203 Adjust the initial value of the PSD and the initial value of the RB according to the service QoS requirement of the UE to obtain the final value of the PSD and the final value of the RB number of the current data transmission;
  • Step 203 specifically includes:
  • TBS TBS Mapping (MCS, N RB ), where ⁇ C(*) indicates that the matching MCS is obtained according to the input ⁇ ⁇ and M using the AMC algorithm, ⁇ ) Enter the MCS and RB number to obtain the matching transport block size TBS; / is the initial value of the transmit power of the UE unit RB; M is the sum of the interference noise of the current channel, ⁇ is! ⁇ The number of RBs scored.
  • TBS TBS Mapping (MCS, D; MCS is given in LTE Release8 protocol TS36213, the mapping relationship between RB number and TBS is shown in Figure 5, three are known Two of them can determine the other one.
  • TBS denotes the MCS in this embodiment, and N PRB denotes in the present example;
  • the PSD is greater than or equal to the preset PSD minimum value, the current value of the PSD is decreased, and the current value of the RB number is recalculated, and the number of RBs is not greater than the available bandwidth of the system idle, then (2032), if If the PSD can no longer be reduced or the RB number cannot be increased any more, the adjustment is no longer performed.
  • the current value of the PSD and the current value of the RB number are used as the final value of the PSD and the final value of the RB number of the current data transmission.
  • the current range of the RB number is adjusted from the minimum value of the RB number to the available bandwidth of the system idle; the adjustment range of the current value of the PSD is the minimum value of the PSD to the maximum value of the PSD.
  • the preset PSD minimum can be any value greater than the sum of the interference noise and the PSD maximum.
  • Step 204 Construct standard resource allocation signaling and send it to the UE.
  • the UE signaling is carried out by converting the PSD and MCS given in the above steps into the interface signaling of the protocol-given standard.
  • these standard signaling includes MCS, N w , and closed-loop power control parameters (), where the sub-frame number is indicated.
  • Fii perRB ii) - (P 0 PUSCH (0 + -PL + A T ⁇ (/))
  • the MPR is the number of information bits carried on a unit resource unit (RE, Resource Element).
  • the present invention further provides a radio resource scheduling apparatus.
  • the apparatus includes: a PSD initial value obtaining module, configured to determine a maximum value of a power spectral density (PSD) of the user equipment (UE), as an initial value of the PSD;
  • PSD power spectral density
  • ⁇ is a PSD max
  • min represents a minimum value which is obtained
  • gtei M ⁇ is the power spectral density required to meet the highest order to adjust encoding mode (MCS)
  • P r clear earn ⁇ 1 1 + ⁇ ⁇ ' ⁇ neighboring area ro)
  • max means to take the maximum value in the set, is the interference threshold of the neighboring cell I
  • 3 ⁇ 4 is the path loss of the neighboring cell I.
  • An RB number initial value obtaining module configured to obtain a minimum value of a resource block (RB) according to the initial value of the PSD, as an initial value of the RB number;
  • the module obtains the initial value of the RB number by the following formula: NRBavailable) , where Hlill represents the minimum value, ”
  • P eM ⁇ is the maximum transmit power of the UE, ⁇ is ? 80 initial value, N— Me indicates the available bandwidth.
  • the adaptive module adjusts the initial value of the PSD and the initial value of the RB number according to the service QoS requirement of the UE to obtain the final value of the PSD and the final value of the RB number of the current data transmission;
  • the adaptive module includes:
  • the resource requirement determining submodule is configured to obtain the current transmission target transport block size (TBS) according to the service data rate requirement of the UE, and record it as 73 ⁇ 4 stiiiremOTi ; obtain corresponding corresponding according to the UE buffer status report (BSR, Buffer Size Report) TBS , recorded as TBS BSR ;
  • a TBS current value calculation submodule configured to calculate a current value of the TBS according to a channel interference condition, a current value of the PSD, and a current value of the RB number;
  • a judging sub-module configured to determine whether the current value of the TBS satisfies 3 ⁇ 4 ⁇ 7BS ⁇ m3 ⁇ 4 - remOTi , and if so, the current value of the PSD and the current value of the RB number are respectively used as the final value of the PSD and the final value of the RB number of the current data transmission If the current value of TBS is greater than 3 ⁇ 43 ⁇ 4 ⁇ , then the TBS is adjusted to 3 ⁇ 43 ⁇ 4 ⁇ , then the current value of the PSD and the number of RBs corresponding to 3 ⁇ 43 ⁇ 4 ⁇ are respectively used as the final value of the PSD and the final value of the RB number of the current data transmission; If the value is less than TBS Requi nt , the RB notifies the adjustment submodule Make adjustments;
  • the adjustment submodule is configured to adjust the current value of the RB number according to the adjustment policy, and recalculate the current value of the PSD according to the current value of the adjusted RB number, or adjust the current value of the PSD, and recalculate the RB number according to the adjusted current value of the PSD. And outputting the current value of the PSD and the current value of the RB number to the TBS current value calculation sub-module.
  • the adjustment range of the current value of the number of RBs output by the adjustment sub-module is the maximum number of the RBs, and the value is the available bandwidth of the system idle; the adjustment range of the current value of the PSD output by the adjustment sub-module is the minimum value of the PSD to The PSD maximum.
  • the minimum value of the PSD is an arbitrary value between the sum of the interference noise and the maximum value of the PSD.
  • the signaling construction output module is configured to construct resource allocation signaling according to the PSD final value and the RB number final value of the current data transmission, and send the resource allocation signaling to the UE.
  • the invention can ensure that the theoretical interference level of each user to the neighboring area is controllable, thereby ensuring that the cell interference level is controllable; under the theoretical interference level, the effective weighing system has the highest spectral efficiency and quality of service (QoS).
  • QoS quality of service
  • the method of the invention can effectively control the noise level of the cell, thereby ensuring network performance, maximally satisfying the QoS requirement of the UE, thereby maximizing user satisfaction, and realizing the system under the premise that the QoS of the UE is satisfied under the defined interference level. Maximize spectral efficiency.
  • the method and apparatus of the present invention determine an upper limit of the transmit power on the unit RB of the UE, that is, an upper limit of the PSD.
  • the interference to the neighboring cell is the maximum allowed by the system; the number of RBs obtained by the power factor is obtained, that is, the number of initial RBs.
  • the QoS requirement of the UE the number of RBs of the UE and the PSD are adjusted, so that the QoS of the UE is satisfied.
  • the spectrum efficiency of the system is guaranteed to be the highest.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé et un appareil d'attribution de ressources radio. Le procédé consiste à: obtenir la valeur maximale de la densité spectrale de puissance (PSD) d'un équipement d'utilisateur (UE) en tant que valeur initiale de la PSD (101); obtenir la valeur minimale d'un nombre de blocs de ressources (RB) comme valeur initiale du nombre de RB en rapport avec la valeur initiale de la PSD (102); régler la valeur initiale de la PSD et la valeur initiale du nombre de RB en fonction des critères de qualité de service (QoS) de l'UE; et obtenir une valeur finale de la PSD et une valeur finale du nombre de RB dans la présente transmission de données (103); et construire le signal d'attribution de ressources en fonction de la valeur finale de la PSD et de la valeur finale du nombre de RB, et transmettre le signal à l'UE (104). La présente invention confère au système une efficacité spectrale maximale tout en répondant aux critères de QoS de l'UE.
PCT/CN2011/076869 2010-11-12 2011-07-05 Procédé et appareil d'attribution de ressources radio WO2012062126A1 (fr)

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CN101741437A (zh) * 2008-11-19 2010-06-16 中国移动通信集团公司 一种上行功率控制方法、系统及设备

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EP4228342A1 (fr) * 2022-02-15 2023-08-16 Nokia Solutions and Networks Oy Planification de liaison montante sensible à la densité spectrale de puissance
US11838876B2 (en) 2022-02-15 2023-12-05 Nokia Solutions And Networks Oy Power spectral density aware uplink scheduling

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