WO2010058245A1 - Précodage pour canal de commande de liaison descendante - Google Patents

Précodage pour canal de commande de liaison descendante Download PDF

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Publication number
WO2010058245A1
WO2010058245A1 PCT/IB2008/054885 IB2008054885W WO2010058245A1 WO 2010058245 A1 WO2010058245 A1 WO 2010058245A1 IB 2008054885 W IB2008054885 W IB 2008054885W WO 2010058245 A1 WO2010058245 A1 WO 2010058245A1
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WIPO (PCT)
Prior art keywords
control channel
user equipment
coding
search space
particular user
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PCT/IB2008/054885
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English (en)
Inventor
Lars E. Lindh
Timo E. Roman
Juha Heiskala
Tommi T. Koivisto
Original Assignee
Nokia Corporation
Nokia, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Nokia Corporation, Nokia, Inc. filed Critical Nokia Corporation
Priority to PCT/IB2008/054885 priority Critical patent/WO2010058245A1/fr
Priority to US13/130,280 priority patent/US20110222629A1/en
Publication of WO2010058245A1 publication Critical patent/WO2010058245A1/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
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0689—Hybrid systems, i.e. switching and simultaneous transmission using different transmission schemes, at least one of them being a diversity transmission scheme

Definitions

  • the exemplary and non-limiting embodiments of this invention relate generally to wireless communication systems, methods, devices and computer programs and, more specifically, relate to multi-antenna techniques for control channel signaling.
  • eNB EUTRAN Node B evolved Node B, a network access node
  • EUTRAN evolved UTRAN also known as LTE or 3.9G
  • EUTRAN also referred to as UTRAN-LTE or as E-UTRA
  • E-UTRA evolved UTRAN
  • the DL access technique will be orthogonal frequency division multiple access (OFDMA)
  • the UL access technique will be single carrier, frequency division multiple access (SC-FDMA).
  • FIG. 1 reproduces Figure 4.1 of 3GPP TS 36.300, and shows the overall architecture of the E-UTRAN system.
  • the EUTRAN system includes eNBs, providing the EUTRA user plane (PDCP/RLC/MAC/PHY) and control plane (RRC) protocol terminations towards the UE.
  • the eNBs are interconnected with each other by means of an X2 interface.
  • the eNBs are also connected by means of an S1 interface to an EPC, more specifically to a MME (Mobility Management Entity) by means of a S1 MME interface and to a Serving Gateway (SGW) by means of a S1 interface.
  • the S1 interface supports a many to many relationship between MMEs / Serving Gateways and eNBs.
  • the eNB hosts the following functions:
  • Radio Resource Management Radio Bearer Control, Radio Admission Control, Connection Mobility Control, Dynamic allocation of resources to UEs in both uplink and downlink (scheduling);
  • LTE Rel-8 uses closed-loop multi-antenna pre-coding only for the transmission of data over the PDSCH (for UEs that are configured for this transmission mode).
  • a method that includes providing to a particular user equipment precoding information; selecting closed-loop spatial coding for a control channel for the particular user equipment; determining at least one control channel element within the particular user equipment's search space of the control channel that is associated with the provided precoding information; and spatially coding the determined at least one control channel element using the provided precoding information to schedule radio resources for the particular user equipment.
  • a computer readable memory storing a program executable by a processor to perform actions which include providing to a particular user equipment precoding information; selecting closed-loop spatial coding for a control channel for the particular user equipment; determining at least one control channel element within the particular user equipment's search space of the control channel that is associated with the provided precoding information; and spatially coding the determined at least one control channel element using the provided precoding information to schedule radio resources for the particular user equipment.
  • an apparatus that includes a memory, a processor and an encoder.
  • the memory stores an association of at least one control channel element to precoding matrices.
  • the processor is configured to determine precoding information to provide to a particular user equipment, to select closed-loop spatial coding for a control channel for a particular user equipment, and to determine at least one control channel element within the particular user equipment's search space of the control channel that is associated in the memory with the precoding information.
  • the encoder is configured to spatially encode the determined at least one control channel element using the precoding matrix in the memory that is associated with the at least one control channel element for scheduling radio resources for the particular user equipment.
  • an apparatus that includes storage means (e.g., a computer readable memory), processing means (e.g., a processor, a digital signal processor, etc.) and encoding means (e.g., an encoder).
  • the storage means is for storing an association of at least one control channel element to precoding matrices.
  • the processing means is for determining precoding information to provide to a particular user equipment, for selecting closed-loop spatial coding for a control channel for a particular user equipment, and for determining at least one control channel element within the particular user equipment's search space of the control channel that is associated in the storage means with the precoding information.
  • the encoding means is for spatially encoding the determined at least one control channel element using the precoding matrix in the storage means that is associated with the at least one control channel element for scheduling radio resources for the particular user equipment.
  • a method that includes determining for a user equipment a search space for a control channel; determining from received radio resource control signaling at least one control channel element within the search space that is to be encoded with closed-loop spatial coding; and decoding the determined at least one control channel element within the search space using a closed-loop spatial decoding with precoding information associated with the at least one control channel element to find radio resources scheduled for the particular user equipment.
  • an apparatus that includes a processor and a decoder.
  • the processor is configured to determine a search space for a control channel, and to determine from received radio resource control signaling at least one control channel element within a user equipment search space that is to be encoded with closed-loop spatial coding.
  • the decoder is configured to decode the at least one control channel element within the search space using a closed-loop spatial decoding with precoding information associated with the at least one control channel element to find radio resources scheduled for the user equipment.
  • Figure 1 reproduces Figure 4 of 3GPP TS 36.300, and shows the overall architecture of the E-UTFxAN system.
  • FIG. 2 is a process flow diagram showing generation of a control channel (PDCCH) according to an exemplary embodiment of this invention.
  • PDCH control channel
  • Figure 3 is a graph showing block error rate performance as a function of signal- to-noise ratio for PDCCH Format 1A (43 bit payload) with transmit diversity versus closed-loop rank-1 wideband precoding, assuming 2 or 4 transmit antennas at eNB and 2 receive antennas at the UE and with PDCCH aggregation level set to 1.
  • Figure 4 is a graph similar to Figure 3, but with PDCCH aggregation level setto 2.
  • Figure 5 is a graph similar to Figure 3, but with PDCCH aggregation level set to 8.
  • Figure 6 is a schematic diagram illustrating closed-loop pre-coding for PDCCH with RRC signaling of UE specific PMI according to an exemplary embodiment of the invention detailed herein as mode 1.
  • Figure 7 is a schematic diagram similar to Figure 6, but with transmit diversity as default/fall-back mode to closed-loop pre-coding according to an exemplary embodiment detailed herein as mode 2.
  • Figure 8 is a schematic diagram similar to Figure 6, but with implicit PMI signaling for PDCCH transmission via UE-allocated CCE positions, while allowing transmit diversity as default/fall-back mode as in Figure 7, according to an exemplary embodiment detailed herein as mode 3.
  • Figure 9A shows a simplified block diagram of various electronic devices that are suitable for use in practicing the exemplary embodiments of this invention.
  • Figure 9B shows a more particularized block diagram of a user equipment such as that shown at Figure 9A.
  • Figure 10 is a logic flow diagram that illustrates the operation of a method, and a result of execution of computer program instructions embodied on a computer readable memory, in accordance with the exemplary embodiments of this invention.
  • the various names used for the described parameters are not intended to be limiting in any respect, as these parameters may be identified by any suitable names.
  • the various names assigned to different channels e.g., PDCCH
  • the various channels of either the E-UTRAN system or other wireless systems may be identified by any suitable names.
  • Embodiments of this invention employ closed-loop pre-coding, in addition to transmit (tx)- diversity, in the downlink control signaling.
  • One technical advantage of this is an improvement in the coverage and in spectral efficiency, as compared to using only open- loop transmit diversity on the multi-antenna DL control channel transmissions.
  • Pre-coding is based on the observation that if the eNB has knowledge of the channel state information CSI then the transmission channel can be coded or transformed at the transmitter side to obtain a better more efficient transmission. Pre- coding using that reported CSI can therefore improve spectral efficiency. It is assumed that the UE measures and reports the CSI to the eNB for embodiments of these teachings.
  • open-loop spatial coding e.g., multi-antenna transmit diversity
  • closed-loop spatial coding technique e.g., multi-antenna pre-coding based on CSI
  • the selected spatial coding is used on the control channel (e.g., the PDCCH) to schedule radio resources (e.g., the PDSCH and/or PUSCH).
  • Pre-coding can be both wideband (i.e. the same transmission pre-coding weights are used over the whole system bandwidth) and frequency selective (the transmission pre-coding weights differ from one frequency chunk to another, where the chunk size of pre-coding granularity is a parameter to be adjusted).
  • each PDCCH (for each UE) in the downlink control channel can be transmitted either with transmit diversity or closed-loop pre-coding at the discretion of the eNB.
  • transmit diversity for each UE
  • closed-loop pre-coding is a technique which requires channel state information reported by the UE.
  • the format of the downlink control information and the channel coding is the same in both cases, it is only the spatial coding of the PDCCH that differs.
  • PDCCHs that are spatially encoded using transmit diversity can be multiplexed in the same subframe with PDCCHs that are spatially encoded using closed-loop pre-coding.
  • FIG. 2 is a high level block diagram showing process steps for the selective spatial coding in the eNB, supporting both combined pre-coded and transmit-diversity.
  • the payload for the downlink control information (DCI) and the DCI format is determined.
  • the forward error control (e.g., CRC, parity bits, etc.) and rate matching for the PDCCH are determined.
  • the PDCCH is scrambled and modulated/permutated, respectively.
  • a selection is made as to which spatial diversity coding is to be used: diversity mapping to antenna ports (open-loop) at block 210, or pre-coding according to a codebook of pre-coding matrix indices PMI at block 212.
  • the PDCCH is mapped to resource elements and thereafter transmitted over the air interface to the UE for which the selection was made.
  • block 210 will always be selected for Rel-8 compliant terminals and for Rel-9/LTE-Advanced compliant terminals the selection as between blocks 210 and 212 may be made based on the validity of CSI reported by that terminal, which validity may depend on speed of the terminal.
  • the selection as between blocks 210 and 212 show that the subcarriers belonging to an open-loop transmit-diversity pre-coded PDCCH are spatially coded in a different way than the subcarriers belonging to a closed-loop pre-coded PDCCH.
  • the LTE Rel-8 terminals look for LTE Rel-8 PDCCH (which are transmitted using open-transmit diversity pre-coding by the above example) but the LTE- Advanced terminals will look for both LTE Rel-8 and LTE-Advanced PDCCHs (that can either use open-loop or closed-loop pre-coding according to the above example).
  • the closed-loop pre-coding may be accomplished: wideband and frequency selective.
  • the wideband pre-coding embodiment the same spatial mapping is used for all subcarriers used for pre-coding.
  • the frequency selective embodiment the mapping is different for different parts of the frequency band.
  • the wideband embodiment is seen to be better attuned for a LTE- Advanced deployment. This is because a PDCCH is permutated over the whole bandwidth.
  • the frequency selective embodiment for the closed-loop pre-coding may be readily implemented, even in LTE-Advanced, if such report is available from the UE.
  • UE reports for both wideband and frequency selective pre-coding are within the bounds of LTE Rel-8.
  • Another criterion by which the selection between open-loop and closed-loop spatial coding may be done is the speed of the UE for which the PDCCH is intended. Closed-loop pre-coding for PDCCH is more appropriate for low-mobility UEs (e.g., those in a building rather than in a moving vehicle). For high mobility UEs, transmit diversity spatial coding is more appropriate because the UE reported pre-coding feedback quickly becomes outdated with fast channel variation over time. Thus for a fast moving UE the reported CSI is valid over a much shorter period of time.
  • the eNB may choose transmit diversity for the fast moving UE and pre-coding for the slow moving UE in a case where both UEs reported their CSI at roughly the same time and also where the eNB sends their PDCCHs at roughly the same time, because the eNB will see that the fast moving UE's CSI is no longer valid at the time the eNB must send the next PDCCH to it.
  • the eNB may obtain the UE's speed information, many of which are known in the art: the UE can report its speed; the eNB may estimate the UE's speed from the UE's radio signals, etc.
  • Figs. 3, 4 and 5 illustrate the block error rate performance as a function of the SINR for PDCCH DCI format 1A (assuming 43 bit payload): transmit diversity for PDCCH [as defined for PDCCH in 3GPP TS 36.211 v ⁇ .4.0 (2008-09), Sections 6.3.4.3 and 6.8.4] is compared to closed-loop rank-1 wideband precoding (as defined in the same standard, Sections 6.3.4.2.1 and 6.3.4.2.3).
  • Figs. 3, 4 and 5 show block error rate performance as a function of signal-to-noise ratio for PDCCH Format 1 A (43 bit payload) with transmit diversity (SFBC or SFBC-FSTD) versus closed-loop rank-1 wideband precoding, assuming 2 or 4 transmit antennas at eNB and 2 receive antennas at the UE.
  • the PDCCH aggregation level is set to 1.
  • the PDCCH aggregation level is set to 2.
  • Fig. 5 the PDCCH aggregation level is set to 8.
  • Table 1 Gain [dB] of wideband closed-loop rank-1 pre-coding versus transmit diversity for PDCCH transmission in LTE ReI. 8 (1 % target BLER).
  • LTE Rel-8 the control channel is decoded blindly. That is, each UE searches at different locations, which in LTE Rel-8 is defined by a hashing function, for its own PDCCHs. There is both a common and a UE dedicated search space, and Rel-8 stipulates that the UE shall be able to do 44 blind decoding attempts in a subframe.
  • the hashing function tells each UE which CCEs to monitor (i.e. decode) for a potential PDCCH transmission, given the subframe number, a common or UE-specific search space and the aggregation level (1 , 2, 4, or 8).
  • the control region consists of a set of CCEs, numbered from 0 to ⁇ cc E . t " 1 according to Section 6.8.2 in 3GPP TS 36.211 v8.4.0 (2008-09), where ⁇ cc E . t is the total number of CCEs in the control region of subframe k .
  • the set of PDCCH candidates to monitor are defined in terms of search spaces, where a search space s ⁇ * at aggregation level L e ⁇ 1,2,4,8 ⁇ is defined by a set of PDCCH candidates.
  • the CCEs corresponding to PDCCH candidate m of the search space S k (L) are given by
  • S k (L) at aggregation level L the variable Y k is defined by
  • At least some UEs will have to search for both transmit-diversity spatial coded PDCCHs and also for closed-loop pre-coded PDCCHs.
  • the number of blind decoding attempts can increase due to this dual nature of the UE's search, there are a number of ways to avoid the number of blind decoding attempts increasing too much.
  • Some exemplary approaches to control the blind decoding attempts that may become necessary at the UE include:
  • a UE shall be configured for that (e.g. via RRC signaling).
  • Pre-coding could potentially be implicitly signaled by the position of CCEs used by the PDCCH (this is detailed further below). • Potentially only a subset of all PMIs are allowed in the implicit signaling, so that the UE does not need to check all of them. The subset can be configured via RRC signaling.
  • the UE also needs information on the pre-coding currently applied by the eNB in order to equalize the equivalent transmission channel (which includes the effects of pre-coding) and further in order to demodulate its pre-coded PDCCH transmission.
  • the pre-coding information may in some embodiments be conveyed in the form of a pre- coding matrix index (PMI) which points to a pre-defined pre-coding vector within the pre- coding codebook which is known to both the eNB and the UE.
  • PMI pre- coding matrix index
  • MODE 1 CLOSED-LOOP PRECODING FOR PDCCH WITH RRC SIGNALING OF UE SPECIFIC PMI.
  • the UE is configured to use closed-loop pre-coding for PDCCH transmissions targeted to them.
  • the eNB will notify the UEs via higher layer signaling of which pre-coding matrix index/indices (PMI or PMIs) (i.e. the pre-coding vector or vectors) they should assume for PDCCH transmissions targeted to them.
  • the selection of PMI(s) for each UE can be made on the basis of PMI reports from the UE to the eNB.
  • a single PMI may be reported for the whole frequency band.
  • a set of PMIs may be reported, each corresponding to a specified sub-band/frequency chunk.
  • a further option by which to select the PMI(s) includes exploiting uplink/downlink channel reciprocity e.g. in time domain duplex TDD systems.
  • the RRC message can be delivered with a low-latency to the UE and is CRC protected and hence reliable. Furthermore it is acknowledged by the UE. Hence both eNB and UE would have the same understanding on which PMI(s) is
  • Fig. 6 illustrates one exemplary allocation of PDCCHs among the 4 defined aggregation levels (1 , 2, 4 and 8) for a total of 3 UEs, each configured to receive a pre-coded PDCCH .
  • the information on UE-specific applied PMI(s) has been delivered to each UE via RRC signaling and acknowledged by UEs.
  • UE#1 has a dedicated search space that spans CCE #s 2 through 7; UE#2 has a dedicated search space that spans CCE #s 6 through 11 ; and UE#3 has a dedicated search space that spans CCE #s 9 through 14.
  • the eNB may send the closed-loop spatially coded PDCCH to the individual UE in any of those CCEs of the UE's dedicated search space.
  • the closed-loop spatially coded PDCCH is restricted only to those UE-specific dedicated CCEs, and is not sent in any of the common CCEs.
  • Fig. 6 also shows the dedicated search spaces in aggregation levels 2, 4 and 8, for which any of the CCEs for these aggregation levels may be used for sending the closed-loop spatially encoded PDCCH to the UE having that aggregation level.
  • the UE knows in advance its aggregation level, and therefore its search space, and attempts for each of those CCEs in its dedicated search space to decode the PDCCH using the closed-loop technique and the RRC-signaled PMI. If this fails the UE can then attempt to decode using transmit diversity.
  • MODE 2 CLOSED-LOOP PRECODING FOR PDCCH WITH RRC SIGNALING OF UE
  • CCE #s 3, 5 and 7 are reserved for transmit diversity and that UE need not look/blindly decode in those CCEs for a closed-loop pre-coded CCE.
  • CCE #s 7, 9 and 11 are reserved for transmit diversity PDCCHs. Note that the reservation for fall back transmit diversity need not apply for all UEs in the same CCE; CCE #s 9 and 11 are reserved for transmit diversity PDCCHs for UE2 but not for UE3, and the reverse arrangement is seen at CCE#10.
  • the eNB may send to a particular UE a PDCCH in any of the CCEs in that UE's search space using transmit diversity (as it can in Rel-8).
  • the eNB may use transmit diversity only as a fall-back mode, and the particular UE is understood to first try to decode in those CCEs associated with closed-loop pre- coding with the assumed PMI and if that decoding attempt fails the same UE then tries another decoding looking to those CCEs of its search space that are not exclusively reserved for closed-loop pre-coding (if any are) and assuming transmit diversity.
  • Another particularly elegant embodiment combines the RRC signaling and the CCE mapping in a smart way.
  • the CCEs in which closed-loop pre-coding may be used by the eNB (and which the UE must blindly decode) is mapped to the PMI signaled by the RRC signaling.
  • the eNB may need a bit more flexibility than a single PMI, so instead of a single PMI the eNB signals a subset of PMIs. Once the UE reports the PMI in the uplink, the eNB picks a (small) subset of PMIs and signals this subset to the UE via RRC.
  • PMIs in the subset are mapped to CCEs in a predefined way, and the PDCCH is sent with closed-loop pre-coding to the UE in the CCEs that map to a PMI of the signaled subset.
  • the 'smart' way that the eNB selects the subset of PMIs is to use the vectors in the immediate "neighborhood" of the one that the UE has reported. That's because these are the most likely ones that will be used once the radio channel changes (e.g., the most likely ones that the UE will report later).
  • This embodiment avoids frequent RRC signaling of different PMIs in each case, though it is anticipated that the signaled PMI subset would need to be changed from time to time. This also avoids an excessive amount of blind decoding that the UE may need to do to find the proper PDCCH, while still leaving the eNB sufficient flexibility to find a good closed-loop pre-coding candidate.
  • this embodiment may also use to transmit diversity fallback mode in which certain CCEs are reserved for transmit diversity PDCCHs and the eNB will not use, and the UE will not blindly decode for closed-loop pre-coded PDCCHs in those reserved CCEs.
  • the PMI reported by the UE is not in the active PMI subset (and also since PMI on the PUCCH is not CRC- protected). Since RRC signaling is anyway error-proof in that forward error coding together with cyclic redundancy check coding is used, both the eNB and the UE should always have the common knowledge about the precoding vectors in the set.
  • MODE 3 IMPLICIT PMI SIGNALING FOR PDCCH TRANSMISSION VIA UE-ALLOCATED CCE POSITIONS, WHILE ALLOWING TRANSMIT DIVERSITY AS FALL-BACK MODE.
  • This third mode assumes that UEs are configured to receive their respective PDCCH transmissions in a closed-loop pre-coded manner.
  • the PMI information is implicitly signaled to the UEs and is tied to the CCE positions to which the UE is allocated. Based on the PMI feedback from the UEs, the eNB may follow the UE recommendations by assigning to them CCE positions corresponding to the reported PMIs.
  • the correspondence between a given CCE position and the PMI(s) tied to that CCE is predefined and known in advance to both the UE and the eNB.
  • the signaling to the UE of its aggregation level (which defines its search space) is the implicit signaling of the PMI(s) to use for the individual CCEs in that search space.
  • Fig. 8 shows implicit PMI signaling for PDCCH transmissions via UE-allocated CCE positions (e.g., according to the UE's assigned aggregation level), with transmit diversity as a fall back mode similarto mode 2 above.
  • UE1 is given aggregation level 1 for which its dedicated search space spans CCE #s 2 through 7.
  • aggregation level 1 for which its dedicated search space spans CCE #s 2 through 7.
  • the UE1 will blindly decode CCE2 using PMM and PMI16; and will also blindly decode CCE3 using PM1 12 and PMI15, and so forth. If UE1 does not find a PDCCH for itself in any of those CCEs of its dedicated (or common) CCEs, then it will also look to those same CCEs for its PDCCH using transmit diversity.
  • the eNB can avoid such blocking because there are two PMIs in that CCE to choose from for the two UEs, and it may choose to pre-code the PDCCH for UE2 in CCE10 using PMI2 and to pre-code the PDCCH for UE3 in that same CCE10 using PMI5. Having more than one PMI mapped to a particular CCE may result in the UE having to perform potentially a higher number of blind detections, as the UE would need to blindly try as many hypotheses as the number of PMIs that are tied to a potential CCE allocation.
  • this increase in complexity should be acceptable and not excessive, given the gains provided by pre-coding, and the fact that this increase is small compared to full blind decoding (without any grouping of PMIs) with a large pre-coding codebook.
  • pre-coding codebook For example, currently there are four entries in the 2 transmit-antenna Rel-8 rank-1 codebook, and sixteen entries in the 4 transmit-antenna Rel-8 rank-1 codebook.
  • the usage of transmit diversity may be tied as well to part or all the CCE positions, and can serve as a fall-back-mode as was detailed above with respect t mode 2 and Fig. 7.
  • the PMI index within the PDCCH may contain the whole wideband PMI information to be used for the PDSCH.
  • the PMI index contains some differential information, in case only a subset of the codebook is used for PDCCH pre-coding as is detailed above. This may be addressed by a further antenna weight (PMI) verification at the UE.
  • PMI antenna weight
  • the various embodiments of these teachings achieve the technical advantages of improved capacity and coverage of the DL control channel.
  • the DL control channel has been estimated by the inventors herein to be suboptimal, needing significant time/frequency resources to give enough coverage.
  • the potential increases to the UE's number of blind decoding attempts are addressed above in the various modes.
  • FIG. 9A illustrates a simplified block diagram of various electronic devices and apparatus that are suitable for use in practicing the exemplary embodiments of this invention.
  • a wireless network 1 is adapted for communication over a wireless link 11 with an apparatus, such as a mobile communication device which may be referred to as a UE 10, via a network access node, such as a Node B (base station), and more specifically an eNB 12,
  • the network 1 may include a network control element (NCE) 14 that may include the MME/S-GW functionality shown in Figure 1 , and which provides connectivity with a network 1 , such as a telephone network and/or a data communications network (e.g., the internet).
  • NCE network control element
  • the UE 10 includes a controller, such as a computer or a data processor (DP) 10A, a computer-readable memory medium embodied as a memory (MEM) 10B that stores a program of computer instructions (PROG) 10C, and a suitable radio frequency (RF) transceiver 10D for bidirectional wireless communications with the eNB 12 via one or more antennas.
  • the eNB 12 also includes a controller, such as a computer or a data processor (DP) 12A, a computer- readable memory medium embodied as a memory (MEM) 12B that stores a program of computer instructions (PROG) 12C, and a suitable RF transceiver 12D for communication with the UE 10 via one or more antennas.
  • DP computer or a data processor
  • PROG program of computer instructions
  • RF radio frequency
  • the eNB 12 is coupled via a data / control path 13 to the NCE 14.
  • the path 13 may be implemented as the S1 interface shown in Figure 1.
  • the eNB 12 may also be coupled to another eNB via data / control path 15, which may be implemented as the X2 interface shown in Figure 1.
  • At least one of the PROGs 10C and 12C is assumed to include program instructions that, when executed by the associated DP, enable the device to operate in accordance with the exemplary embodiments of this invention, as will be discussed below in greater detail. That is, the exemplary embodiments of this invention may be implemented at least in part by computer software executable by the DP 10A of the UE 10 and/or by the DP 12A of the eNB 12, or by hardware, or by a combination of software and hardware (and firmware).
  • the UE 10 may be assumed to also include a decoder 10E that can selectively decode (blindly) using the open-loop or closed-loop techniques discussed above, and the eNB 12 may include an encoder 12E that can selectively encode using either technique.
  • the various embodiments of the UE 10 can include, but are not limited to, cellular telephones, personal digital assistants (PDAs) having wireless communication capabilities, portable computers having wireless communication capabilities, image capture devices such as digital cameras having wireless communication capabilities, gaming devices having wireless communication capabilities, music storage and playback appliances having wireless communication capabilities, Internet appliances permitting wireless Internet access and browsing, as well as portable units or terminals that incorporate combinations of such functions.
  • PDAs personal digital assistants
  • portable computers having wireless communication capabilities
  • image capture devices such as digital cameras having wireless communication capabilities
  • gaming devices having wireless communication capabilities
  • music storage and playback appliances having wireless communication capabilities
  • Internet appliances permitting wireless Internet access and browsing, as well as portable units or terminals that incorporate combinations of such functions.
  • the computer readable MEMs 1 OB and 12B may be of any type suitable to the local technical environment and may be implemented using any suitable data storage technology, such as semiconductor based memory devices, flash memory, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory.
  • the DPs 10A and 12A may be of any type suitable to the local technical environment, and may include one or more of general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and processors based on a multicore processor architecture, as non-limiting examples.
  • Figure 9B illustrates further detail of an exemplary UE in both plan view (left) and sectional view (right), and the invention may be embodied in one or some combination of those more function-specific components.
  • the UE 10 has a graphical display interface 20 and a user interface 22 illustrated as a keypad but understood as also encompassing touch-screen technology at the graphical display interface 20 and voice-recognition technology received at the microphone 24.
  • a power actuator 26 controls the device being turned on and off by the user.
  • the exemplary UE 10 may have a camera 28 which is shown as being forward facing (e.g., for video calls) but may alternatively or additionally be rearward facing (e.g., for capturing images and video for local storage).
  • the camera 28 is controlled by a shutter actuator 30 and optionally by a zoom actuator 30 which may alternatively function as a volume adjustment for the speaker(s) 34 when the camera 28 is not in an active mode.
  • FIG. 9B Within the sectional view of Fig. 9B are seen multiple transmit/receive antennas 36 that are typically used for cellular communication.
  • the antennas 36 may be multi- band for use with other radios in the UE.
  • the operable ground plane for the antennas 36 is shown by shading as spanning the entire space enclosed by the UE housing though in some embodiments the ground plane may be limited to a smaller area, such as disposed on a printed wiring board on which the power chip 38 is formed.
  • the power chip 38 controls power amplification on the channels being transmitted and/or across the antennas that transmit simultaneously where spatial diversity is used, and amplifies the received signals.
  • the power chip 38 outputs the amplified received signal to the radio- frequency (RF) chip 40 which demodulates and downconverts the signal for baseband processing.
  • the baseband (BB) chip 42 detects the signal which is then converted to a bit-stream and finally decoded. Similar processing occurs in reverse for signals generated in the apparatus 10 and transmitted from it.
  • Signals to and from the camera 28 pass through an image/video processor 44 which encodes and decodes the various image frames.
  • a separate audio processor 46 may also be present controlling signals to and from the speakers 34 and the microphone 24.
  • the graphical display interface 20 is refreshed from a frame memory 48 as controlled by a user interface chip 50 which may process signals to and from the display interface 20 and/or additionally process user inputs from the keypad 22 and elsewhere.
  • Certain embodiments of the UE 10 may also include one or more secondary radios such as a wireless local area network radio WLAN 37 and a Bluetooth® radio 39, which may incorporate an antenna on-chip or be coupled to an off-chip antenna.
  • secondary radios such as a wireless local area network radio WLAN 37 and a Bluetooth® radio 39, which may incorporate an antenna on-chip or be coupled to an off-chip antenna.
  • various memories such as random access memory RAM 43, read only memory ROM 45, and in some embodiments removable memory such as the illustrated memory card 47 on which the various programs 10C are stored. All of these components within the UE 10 are normally powered by a portable power supply such as a battery 49.
  • the aforesaid processors 38, 40, 42, 44, 46, 50 may operate in a slave relationship to the main processor 10A, 12A, which may then be in a master relationship to them.
  • Embodiments of this invention are most relevant to the baseband processor 42, though it is noted that other embodiments need not be disposed there but may be disposed across various chips and memories as shown or disposed within another processor that combines some of the functions described above for Figure 9B. Any or all of these various processors of Fig. 9B access one or more of the various memories, which may be on-chip with the processor or separate therefrom .
  • Similar function-specific components that are directed toward communications over a network broaderthan a piconet may also be disposed in exemplary embodiments of the access node 12, which may have an array of tower-mounted antennas rather than the two shown at Fig. 9B.
  • FIG. 10 is a logic flow diagram that comprehensively illustrates for each of the eNB and the UE the operation of a method, and a result of execution of computer program instructions, in accordance with the exemplary embodiments of this invention.
  • a method performs, at block 1002 the UE sends and the eNB receives CSI.
  • the eNB sends and the UE receives RRC signaling of PMI, and in another embodiment the PMI is implicit the CCE mapping.
  • the eNB or a component thereof selects between open-loop spatial coding (e.g., multi-antenna transmit diversity) and closed-loop spatial coding (e.g., pre-coding based on CSl) for a control channel (e.g., PDCCH) for the UE.
  • the eNB uses the selected spatial coding on the control channel to schedule radio resources for the UE.
  • the UE determines its search space for a control channel (e.g., from a hashing function that takes into account the aggregation level, subframe index, RNTI, and the number of CCEs within the control region).
  • a control channel e.g., from a hashing function that takes into account the aggregation level, subframe index, RNTI, and the number of CCEs within the control region.
  • UE decodes the control channel within the search space using an open-loop spatial decoding and a closed-loop spatial decoding to find radio resources scheduled for the UE.
  • Block 1010 shows that the closed-loop spatial coding can in one embodiment be wideband and in another embodiment be frequency selective.
  • Block 1012 shows the embodiment to limit the UE's blind decoding attempts by which the closed-loop spatial coding is restricted to the PDCCH which is placed in only dedicated CCEs of the aggregation level for that UE.
  • Block 1014 shows the embodiment in which different CCEs are reserved for either closed-loop or open-loop spatial coding: a first subset of CCEs is reserved for open-loop and/or a second subset of CCEs is reserved for closed-loop. Each of these subsets have at least one CCE.
  • Block 1016 shows the embodiment in which the eNB sends and the UE receives RRC signaling of a subset of PMIs which the UE will use for the decoding, and in this embodiment there is more than one PMI in the subset.
  • block 1018 shows the implicit case in which the eNB and the UE use the PMI that maps to the CCE to encode/decode the closed-loop PDCCH that is placed in that CCE.
  • the various blocks shown in Figure 10 may be viewed as method steps, and/or as operations that result from operation of computer program code for the respective eNB and UE separately, and/or as a plurality of coupled logic circuit elements constructed to carry out the associated function(s) for the respective eNB or UE separately.
  • the various exemplary embodiments may be implemented in hardware or special purpose circuits, software, logic or any combination thereof.
  • some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device, although the invention is not limited thereto.
  • firmware or software which may be executed by a controller, microprocessor or other computing device, although the invention is not limited thereto.
  • While various aspects of the exemplary embodiments of this invention may be illustrated and described as block diagrams, flow charts, or using some other pictorial representation, it is well understood that these blocks, apparatus, systems, techniques or methods described herein may be implemented in, as non-limiting examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.
  • the integrated circuit, or circuits may comprise circuitry (as well as possibly firmware) for embodying at least one or more of a data processor or data processors, a digital signal processor or processors, baseband circuitry and radio frequency circuitry that are configurable so as to operate in accordance with the exemplary embodiments of this invention.
  • connection means any connection or coupling, either direct or indirect, between two or more elements, and may encompass the presence of one or more intermediate elements between two elements that are “connected” or “coupled” together.
  • the coupling or connection between the elements can be physical, logical, or a combination thereof.
  • two elements may be considered to be “connected” or “coupled” together by the use of one or more wires, cables and/or printed electrical connections, as well as by the use of electromagnetic energy, such as electromagnetic energy having wavelengths in the radio frequency region, the microwave region and the optical (both visible and invisible) region, as several non-limiting and non-exhaustive examples.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
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  • Mobile Radio Communication Systems (AREA)

Abstract

Selon l'invention, des informations de précodage sont fournies (implicitement ou explicitement) à un équipement utilisateur (UE) particulier. Un codage spatial en boucle fermée pour un canal de commande est sélectionné pour l'équipement utilisateur particulier, et au moins un élément de canal de commande (CCE) est déterminé dans l'espace de recherche de l'équipement utilisateur particulier du canal de commande qui est associé aux informations de précodage fournies. Le ou les CCE déterminés sont spatialement codés à l'aide des informations de précodage fournies afin de planifier des ressources radio pour l'équipement utilisateur particulier. L'équipement utilisateur détermine un espace de recherche pour un canal de commande, et détermine, à partir d'une signalisation de commande de ressources radio reçue, au moins un CCE dans l'espace de recherche qui doit être codé avec un codage spatial en boucle fermée. L'équipement utilisateur décode le ou les CCE déterminés dans l'espace de recherche à l'aide d'un décodage spatial en boucle fermée avec des informations de précodage associées au ou aux CCE afin de trouver des ressources radio planifiées pour l'équipement utilisateur particulier.
PCT/IB2008/054885 2008-11-20 2008-11-20 Précodage pour canal de commande de liaison descendante WO2010058245A1 (fr)

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US13/130,280 US20110222629A1 (en) 2008-11-20 2008-11-20 Pre-coding for downlink control channel

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