Source: https://patents.google.com/patent/US9137075B2/en
Timestamp: 2019-09-17 01:00:33
Document Index: 792740868

Matched Legal Cases: ['Application No. 2009135390', 'Application No. 2008800005724', 'Application No. 2009135390108', 'Application No. 200880005724', 'Application No. 2008800005724', 'Application No. 200880005724']

US9137075B2 - Subcarrier spacing identification - Google Patents
Subcarrier spacing identification Download PDF
US9137075B2
US9137075B2 US11/943,440 US94344007A US9137075B2 US 9137075 B2 US9137075 B2 US 9137075B2 US 94344007 A US94344007 A US 94344007A US 9137075 B2 US9137075 B2 US 9137075B2
US11/943,440
US20080205351A1 (en
2007-11-20 Application filed by Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
2008-02-09 Assigned to TELEFONAKTIEBOLAGET LM ERICSSON (PUBL) reassignment TELEFONAKTIEBOLAGET LM ERICSSON (PUBL) ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BALDEMAIR, ROBERT, DAHLMAN, ERIK, PARKVALL, STEFAN, LINDOFF, BENGT
2008-08-28 Publication of US20080205351A1 publication Critical patent/US20080205351A1/en
2015-09-15 Publication of US9137075B2 publication Critical patent/US9137075B2/en
FIG. 8 depicts an embodiment of an apparatus 800 for indicating which of a first subcarrier spacing and a second subcarrier spacing is presently in use in a cellular communication system.
FIG. 9 depicts an embodiment of an apparatus 900 for detecting which of a first subcarrier spacing and a second subcarrier spacing is presently in use in a cellular communication system.
FIG. 10 depicts an alternative embodiment of an apparatus 1000 for detecting which of a first subcarrier spacing and a second subcarrier spacing is presently in use in a cellular communication system.
FIG. 11 depicts another exemplary embodiment of an apparatus 1100 for indicating which of a first subcarrier spacing and a second subcarrier spacing is presently in use in a cellular communication system.
FIG. 12 depicts another exemplary embodiment of an apparatus 1200 for detecting which of a first subcarrier spacing and a second subcarrier spacing is presently in use in a cellular communication system.
s 15 ⁢ ⁢ kHz ⁡ ( n ) = ∑ k = 0 N - 1 ⁢ S k ⁢ ⅇ ( j2 · π / N ) · k · n , ⁢ n = 0 , 1 , … ⁢ , N - 1 ( 1 )
FIG. 2B is a diagram illustrating a second type of synchronization signal 203, which is used when a subcarrier spacing is a smaller of two possible sizes (herein illustrated as P-SySMODE2). The second type of synchronization signal 203 comprises two (or in other embodiments, more than two) components (in this example denoted first component 203 a and second component 203 b) transmitted in immediate succession during two (or in other embodiments, more than two) contiguous time periods for a total duration of tMODE2. In the time domain, the waveform of each of the first and second components 203 a, 203 b of the second type of synchronization signal 203 is identical to that of the first type of synchronization signal 201. Consequently, each of the first and second components 203 a, 203 b has a duration equal to tMODE1 and can be considered an instance of the first type of synchronization signal 201.
S ^ k = { S k / 2 for ⁢ ⁢ k = even 0 for ⁢ ⁢ k = odd ( 2 )
s 7.5 ⁢ ⁢ kHz ⁡ ( n ) = ⁢ ∑ k = 0 2 ⁢ N - 1 ⁢ S ^ k ⁢ ⅇ ( j2π / ( 2 ⁢ N ) ) · k · n = ⁢ ∑ k = 0 k ⁢ ⁢ even 2 ⁢ N - 1 ⁢ S ^ k ⁢ ⅇ ( j2π / ( 2 ⁢ N ) ) · k · n + ∑ k = 0 k ⁢ ⁢ odd 2 ⁢ N - 1 ⁢ S ^ k ⁢ ⅇ ( j2π / ( 2 ⁢ N ) ) · k · n ︸ 0 ⁢ ⁢ since ⁢ ⁢ S ^ k ⁢ ⁢ is ⁢ ⁢ 0 ⁢ ⁢ for ⁢ ⁢ odd ⁢ ⁢ k = ⁢ ∑ k = 0 k ⁢ ⁢ even 2 ⁢ N - 1 ⁢ S ^ k ⁢ ⅇ ( j2π / ( 2 ⁢ N ) ) · k · n , ⁢ n = 0 , 1 , … ⁢ , 2 ⁢ N ⁢ - 1. ( 3 )
s 7.5 ⁢ ⁢ kHz ⁡ ( n ) = ∑ k ′ = 0 N - 1 ⁢ S ^ 2 ⁢ k ′ ⁢ ⅇ ( j2π / ( 2 ⁢ N ) ) · 2 ⁢ k ′ · n , ⁢ n = 0 , 1 , … ⁢ , 2 ⁢ N - 1. ( 4 )
s 7.5 ⁢ ⁢ kHz ⁡ ( n ) = ⁢ ∑ k ′ = 0 N - 1 ⁢ S k ′ ⁢ ⅇ ( j2π / ( 2 ⁢ N ) ⁢ 0 · 2 ⁢ k ′ · n = ⁢ ∑ k = 0 N - 1 ⁢ S k ⁢ ⅇ ( j2 · π / N ) · k · n , ⁢ n = 0 , 1 , … ⁢ , 2 ⁢ N - 1 , ( 5 )
Various embodiments consistent with the above teachings will now be described with reference to FIGS. 8 through 12.
FIG. 8 depicts an embodiment of an apparatus 800 for indicating which of a first subcarrier spacing and a second subcarrier spacing is presently in use in a cellular communication system. The exemplary apparatus 800 comprises logic circuitry 801 that responds to the first subcarrier spacing presently being in use by generating a first type of synchronization signal, and logic circuitry 803 that responds to the second subcarrier spacing presently being in use by generating a second type of synchronization signal. A time domain representation of the second type of synchronization signal includes a plurality of instances of the first type of synchronization signal. The apparatus 800 further includes logic circuitry that transmits one of the first type of synchronization signal and the second type of synchronization signal in response to whichever of the first type of synchronization signal and the second type of synchronization signal was generated.
In another aspect of the embodiment depicted in FIG. 8, a radio interface of the cellular communication system utilizes Orthogonal Frequency Division Multiplexing (OFDM). Accordingly, the logic circuitry 801 that generates the first type of synchronization signal comprises first mapping logic circuitry 807 that maps a set of synchronization symbols, Sk, (0≦k≦N−1) onto a contiguous set of N subcarriers, each of the N subcarriers having the first subcarrier spacing. Further, the logic circuitry 803 that generates the second type of synchronization signal comprises second mapping logic circuitry 809 that maps the set of synchronization symbols, Sk, onto a set of n·N subcarriers (n>1) such that every nth one of the n·N carries one of the N synchronization symbols, and remaining ones of the n·N subcarriers carry zero values, wherein each of the n·N subcarriers has the second subcarrier spacing, and wherein k, N, and n are integers.
FIG. 9 depicts an embodiment of an apparatus 900 for detecting which of a first subcarrier spacing and a second subcarrier spacing is presently in use in a cellular communication system. The exemplary apparatus 900 comprises logic circuitry 901 that processes a received signal to derive therefrom a synchronization signal. The apparatus 900 further comprises logic circuitry 903 that detects whether a time domain representation of the synchronization signal comprises only one instance of a first type of synchronization signal. Also, the apparatus 900 includes logic circuitry 905 that utilizes the first subcarrier spacing in one or more subsequent communication operations if the time domain representation of the synchronization signal comprises only one instance of the first type of synchronization signal; and logic circuitry 907 that utilizes the second subcarrier spacing in one or more subsequent communication operations if the time domain representation of the synchronization signal comprises more than one instance of the first type of synchronization signal.
In another aspect of the embodiment depicted in FIG. 9, the logic circuitry 903 that detects whether the time domain representation of the synchronization signal comprises only one instance of the first type of synchronization signal comprises logic circuitry 909 that generates correlation results by correlating the received signal against the first type of synchronization signal; and logic circuitry 911 that detects whether the correlation results include distinct peaks separated in time by a predetermined amount.
FIG. 10 depicts an alternative embodiment of an apparatus 1000 for detecting which of a first subcarrier spacing and a second subcarrier spacing is presently in use in a cellular communication system. The exemplary apparatus 1000 comprises logic circuitry 901 that processes a received signal to derive therefrom a synchronization signal. The apparatus 1000 further comprises logic circuitry 1001 that detects whether a time domain representation of the synchronization signal comprises only one instance of a first type of synchronization signal. Also, the apparatus 1000 includes logic circuitry 905 that utilizes the first subcarrier spacing in one or more subsequent communication operations if the time domain representation of the synchronization signal comprises only one instance of the first type of synchronization signal; and logic circuitry 907 that utilizes the second subcarrier spacing in one or more subsequent communication operations if the time domain representation of the synchronization signal comprises more than one instance of the first type of synchronization signal.
In this embodiment, the logic circuitry 1001 that detects whether the time domain representation of the synchronization signal comprises only one instance of the first type of synchronization signal comprises: logic circuitry 1003 that generates correlation results by correlating the received signal with a delayed copy of the received signal, wherein an amount of delay applied to generate the delayed copy of the received signal corresponds to a time period of first type of synchronization signal; and logic circuitry 1005 that detects whether the correlation results include a distinct peak.
FIG. 11 depicts another exemplary embodiment of an apparatus 1100 for indicating which of a first subcarrier spacing and a second subcarrier spacing is presently in use in a cellular communication system. The apparatus 1100 comprises logic circuitry 1101 configured to generate a first type of synchronization signal in response to the first subcarrier spacing presently being in use, and logic circuitry 1103 configured to generate a second type of synchronization signal in response to the second subcarrier spacing presently being in use. The apparatus 1100 also includes logic circuitry 1105 configured to transmit one of the first type of synchronization signal and the second type of synchronization signal in response to whichever of the first type of synchronization signal and the second type of synchronization signal was generated. Further in this exemplary embodiment, a time domain representation of the first type of synchronization signal includes a first plurality of instances of a basic waveform; a time domain representation of the second type of synchronization signal includes a second plurality of instances of the basic waveform; and the first plurality is not equal to the second plurality.
FIG. 12 depicts another exemplary embodiment of an apparatus 1200 for detecting which of a first subcarrier spacing and a second subcarrier spacing is presently in use in a cellular communication system. The exemplary apparatus 1200 comprises logic circuitry 901 configured to process a received signal to derive therefrom a synchronization signal; logic circuitry 1201 configured to detect how many instances of a basic waveform are included in a time domain representation of the synchronization signal; logic circuitry 1203 configured to utilize the first subcarrier spacing in one or more subsequent communication operations if the time domain representation of the synchronization signal comprises a first plurality of instances of the basic waveform; and logic circuitry 1205 configured to utilize the second subcarrier spacing in one or more subsequent communication operations if the time domain representation of the synchronization signal comprises a second plurality of instances of the basic waveform, wherein the first plurality is not equal to the second plurality.
1. A method of indicating which of a first subcarrier spacing and a second subcarrier spacing is presently in use in a cellular communication system, the method comprising:
in response to the first subcarrier spacing presently being in use, generating a first type of synchronization signal;
in response to the second subcarrier spacing presently being in use, generating a second type of synchronization signal; and
transmitting one of the first type of synchronization signal and the second type of synchronization signal in response to whichever of the first type of synchronization signal and the second type of synchronization signal was generated,
wherein a time domain representation of the second type of synchronization signal includes a plurality of instances of the first type of synchronization signal.
a radio interface of the cellular communication system utilizes Orthogonal Frequency Division Multiplexing (OFDM);
generating the first type of synchronization signal comprises mapping a set of synchronization symbols, Sk, (0≦k≦N−1) onto a contiguous set of N subcarriers, each of the N subcarriers having the first subcarrier spacing; and
generating the second type of synchronization signal comprises mapping the set of synchronization symbols, Sk, onto a set of n·N subcarriers (n>1) such that every nth one of the n·N carries one of the N synchronization symbols, and remaining ones of the n·N subcarriers carry zero values, wherein each of the n·N subcarriers has the second subcarrier spacing,
wherein k, N, and n are integers.
the first subcarrier spacing is 15 kHz; and
the second subcarrier spacing is 7.5 kHz.
6. A method of detecting which of a first subcarrier spacing and a second subcarrier spacing is presently in use in a cellular communication system, the method comprising:
processing a received signal to derive therefrom a synchronization signal;
detecting whether a time domain representation of the synchronization signal comprises only one instance of a first type of synchronization signal; and
if the time domain representation of the synchronization signal comprises only one instance of the first type of synchronization signal, then utilizing the first subcarrier spacing in one or more subsequent communication operations; and
if the time domain representation of the synchronization signal comprises more than one instance of the first type of synchronization signal, then utilizing the second subcarrier spacing in one or more subsequent communication operations.
7. The method of claim 6, wherein detecting whether the time domain representation of the synchronization signal comprises only one instance of the first type of synchronization signal comprises:
generating correlation results by correlating the received signal against the first type of synchronization signal; and
detecting whether the correlation results include distinct peaks separated in time by a predetermined amount.
8. The method of claim 6, wherein detecting whether the time domain representation of the synchronization signal comprises only one instance of the first type of synchronization signal comprises:
generating correlation results by correlating the received signal with a delayed copy of the received signal, wherein an amount of delay applied to generate the delayed copy of the received signal corresponds to a time period of first type of synchronization signal; and
detecting whether the correlation results include a distinct peak.
10. An apparatus for indicating which of a first subcarrier spacing and a second subcarrier spacing is presently in use in a cellular communication system, the apparatus comprising:
logic circuitry that responds to the first subcarrier spacing presently being in use by generating a first type of synchronization signal;
logic circuitry that responds to the second subcarrier spacing presently being in use by generating a second type of synchronization signal; and
logic circuitry that transmits one of the first type of synchronization signal and the second type of synchronization signal in response to whichever of the first type of synchronization signal and the second type of synchronization signal was generated,
the logic circuitry that generates the first type of synchronization signal comprises logic circuitry that maps a set of synchronization symbols, Sk, (0≦k≦N−1) onto a contiguous set of N subcarriers, each of the N subcarriers having the first subcarrier spacing; and
the logic circuitry that generates the second type of synchronization signal comprises logic circuitry that maps the set of synchronization symbols, Sk, onto a set of n·N subcarriers (n>1) such that every nth one of the n·N carries one of the N synchronization symbols, and remaining ones of the n·N subcarriers carry zero values, wherein each of the n·N subcarriers has the second subcarrier spacing,
15. An apparatus for detecting which of a first subcarrier spacing and a second subcarrier spacing is presently in use in a cellular communication system, the apparatus comprising:
logic circuitry that processes a received signal to derive therefrom a synchronization signal;
logic circuitry that detects whether a time domain representation of the synchronization signal comprises only one instance of a first type of synchronization signal; and
logic circuitry that utilizes the first subcarrier spacing in one or more subsequent communication operations if the time domain representation of the synchronization signal comprises only one instance of the first type of synchronization signal; and
logic circuitry that utilizes the second subcarrier spacing in one or more subsequent communication operations if the time domain representation of the synchronization signal comprises more than one instance of the first type of synchronization signal.
16. The apparatus of claim 15, wherein the logic circuitry that detects whether the time domain representation of the synchronization signal comprises only one instance of the first type of synchronization signal comprises:
logic circuitry that generates correlation results by correlating the received signal against the first type of synchronization signal; and
logic circuitry that detects whether the correlation results include distinct peaks separated in time by a predetermined amount.
17. The apparatus of claim 15, wherein the logic circuitry that detects whether the time domain representation of the synchronization signal comprises only one instance of the first type of synchronization signal comprises:
logic circuitry that generates correlation results by correlating the received signal with a delayed copy of the received signal, wherein an amount of delay applied to generate the delayed copy of the received signal corresponds to a time period of first type of synchronization signal; and
logic circuitry that detects whether the correlation results include a distinct peak.
19. A method of indicating which of a first subcarrier spacing and a second subcarrier spacing is presently in use in a cellular communication system, the method comprising:
a time domain representation of the first type of synchronization signal includes a first plurality of instances of a basic waveform;
a time domain representation of the second type of synchronization signal includes a second plurality of instances of the basic waveform; and
the first plurality is not equal to the second plurality.
20. An apparatus for indicating which of a first subcarrier spacing and a second subcarrier spacing is presently in use in a cellular communication system, the apparatus comprising:
logic circuitry configured to generate a first type of synchronization signal in response to the first subcarrier spacing presently being in use;
logic circuitry configured to generate a second type of synchronization signal in response to the second subcarrier spacing presently being in use; and
logic circuitry configured to transmit one of the first type of synchronization signal and the second type of synchronization signal in response to whichever of the first type of synchronization signal and the second type of synchronization signal was generated,
21. A method of detecting which of a first subcarrier spacing and a second subcarrier spacing is presently in use in a cellular communication system, the method comprising:
detecting how many instances of a basic waveform are included in a time domain representation of the synchronization signal; and
if the time domain representation of the synchronization signal comprises a first plurality of instances of the basic waveform, then utilizing the first subcarrier spacing in one or more subsequent communication operations; and
if the time domain representation of the synchronization signal comprises a second plurality of instances of the basic waveform, then utilizing the second subcarrier spacing in one or more subsequent communication operations,
wherein the first plurality is not equal to the second plurality.
22. An apparatus for detecting which of a first subcarrier spacing and a second subcarrier spacing is presently in use in a cellular communication system, the apparatus comprising:
logic circuitry configured to process a received signal to derive therefrom a synchronization signal;
logic circuitry configured to detect how many instances of a basic waveform are included in a time domain representation of the synchronization signal; and
logic circuitry configured to utilize the first subcarrier spacing in one or more subsequent communication operations if the time domain representation of the synchronization signal comprises a first plurality of instances of the basic waveform; and
logic circuitry configured to utilize the second subcarrier spacing in one or more subsequent communication operations if the time domain representation of the synchronization signal comprises a second plurality of instances of the basic waveform,
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Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:LINDOFF, BENGT;BALDEMAIR, ROBERT;DAHLMAN, ERIK;AND OTHERS;SIGNING DATES FROM 20080122 TO 20080129;REEL/FRAME:020485/0579